diff --git a/kiln-core/src/action.rs b/kiln-core/src/action.rs
index 94f943d..8042d0e 100644
--- a/kiln-core/src/action.rs
+++ b/kiln-core/src/action.rs
@@ -176,20 +176,12 @@ pub fn apply_teleport(board: &mut Board, target: i64, x: i64, y: i64) -> Result<
             None
         };
         if let Some(from) = from {
-            if from.0 != x || from.1 != y {
-                // Check if we're blocked:
-                if board.get(x, y).is_none() {
-                    // Not blocked, move it
-                    let thing = board.get_mut(from.0, from.1).take();
-                    *board.get_mut(x, y) = thing;
-                    Ok(())
-                } else {
-                    Err(format!("teleport({target},{x},{y}): destination is solid"))
-                }
-            } else {
-                // We're teleporting to the same place, which is fine I guess, but no effect:
-                Ok(())
+            // Check if we're blocked:
+            if (from.0 != x || from.1 != y) && board.get(x, y).is_none() {
+                // Not blocked, move it
+                board.move_cell(from.into(), (x, y).into());
             }
+            Ok(())
         } else {
             Err(format!("teleport({target},{x},{y}): no such object"))
         }
diff --git a/kiln-core/src/board.rs b/kiln-core/src/board.rs
index 6d9344f..6f65c29 100644
--- a/kiln-core/src/board.rs
+++ b/kiln-core/src/board.rs
@@ -2,7 +2,7 @@ use crate::floor::Floor;
 use crate::fov::{color_to_rgb, FovCaster, Lighting};
 use crate::glyph::Glyph;
 use crate::log::LogLine;
-use crate::utils::Direction;
+use crate::utils::{Direction, Point};
 use crate::utils::{ObjectId, RegistryValue};
 use std::collections::{HashMap, HashSet};
 use crate::portal::Portal;
@@ -619,6 +619,30 @@ impl Board {
             }
         }
     }
+
+    /// Moves whatever is in `from` to `to`, leaving an empty cell behind. Silent no-op if either
+    /// `from` or `to` is out of bounds, or if they're the same cell.
+    pub fn move_cell(&mut self, from: Point, to: Point) {
+        if from != to && self.in_bounds(from.into()) && self.in_bounds(to.into()) {
+            let thing = self.get_mut(from.x as usize, from.y as usize).take();
+            self.grid[to.x as usize + to.y as usize * self.width] = thing;
+        }
+    }
+
+    /// Return whether the given point is empty
+    pub fn is_empty(&self, p: Point) -> bool {
+        self.get(p.x as usize, p.y as usize).is_none()
+    }
+
+    /// Return whether the given point contains the player
+    pub fn is_player(&self, p: Point) -> bool {
+        matches!(self.get(p.x as usize, p.y as usize), Some(Tile::Player))
+    }
+
+    /// Return whether the given point contains an object
+    pub fn is_object(&self, p: Point) -> bool {
+        matches!(self.get(p.x as usize, p.y as usize), Some(Tile::Object(_)))
+    }
 }
 
 #[cfg(test)]
diff --git a/kiln-core/src/builtin.rs b/kiln-core/src/builtin.rs
index edbabe1..7640818 100644
--- a/kiln-core/src/builtin.rs
+++ b/kiln-core/src/builtin.rs
@@ -112,12 +112,12 @@ const fn g(tile: char, r: u8, gr: u8, b: u8) -> Glyph {
 
 builtins! {
     Gem => ["gem" => g('♦', 0x50, 0x50, 0xFF)] {
-        enter: EnterResponse::Grab,
+        enter: EnterResponse::Block,
         optics: Optics { opaque: false, glow: 0 },
         script: ScriptKey::Builtin("gem"),
     },
     Heart => ["heart" => g('♡', 0xCC, 0x22, 0x22)] {
-        enter: EnterResponse::Grab,
+        enter: EnterResponse::Block,
         optics: Optics { opaque: false, glow: 0 },
         script: ScriptKey::Builtin("heart"),
     },
@@ -147,7 +147,7 @@ builtins! {
         "transporter_east"  => g(')',  0x55, 0xFF, 0xFF),   // ')'
         "transporter_west"  => g('(',  0x55, 0xFF, 0xFF),   // '('
     ] {
-        enter: EnterResponse::Hook,
+        enter: EnterResponse::Block,
         optics: Optics { opaque: false, glow: 0 },
         script: ScriptKey::Builtin("transporter"),
     },
@@ -174,9 +174,10 @@ builtins! {
         script: ScriptKey::None
     },
     Crate => ["crate" => g('■', 0xaa, 0xaa, 0xaa)] { // CP437 ■ (small filled square)
-        enter: EnterResponse::Push(Pushable::Any),
+        //enter: EnterResponse::Push(Pushable::Any),
+        enter: EnterResponse::Block,
         optics: Optics { opaque: true, glow: 0 },
-        script: ScriptKey::None
+        script: ScriptKey::Builtin("crate"),
     },
     HCrate => ["hcrate" => g('↔', 0xaa, 0xaa, 0xaa)] { // CP437 ↔ (left-right arrow) — pushable east/west
         enter: EnterResponse::Push(Pushable::Horizontal),
@@ -199,6 +200,7 @@ lazy_static! {
         m.insert(ScriptKey::Builtin("spinner"), include_str!("scripts/spinner.rhai"));
         m.insert(ScriptKey::Builtin("transporter"), include_str!("scripts/transporter.rhai"));
         m.insert(ScriptKey::Builtin("key"), include_str!("scripts/key.rhai"));
+        m.insert(ScriptKey::Builtin("crate"), include_str!("scripts/crate.rhai"));
         m
     };
 }
diff --git a/kiln-core/src/game.rs b/kiln-core/src/game.rs
index 288c4da..6c0395f 100644
--- a/kiln-core/src/game.rs
+++ b/kiln-core/src/game.rs
@@ -2,10 +2,11 @@ use crate::action::{apply_push, apply_shift, apply_teleport, Action, BoardAction
 use crate::board::Board;
 use crate::log::LogLine;
 use crate::script::ScriptHost;
-use crate::utils::{Direction, ObjectId};
+use crate::utils::{Direction, ObjectId, Point, Pushable};
 use crate::world::World;
 use std::cell::{Ref, RefMut};
 use std::collections::{BTreeSet, HashSet, VecDeque};
+use std::fmt::format;
 use std::hash::Hash;
 use std::time::Duration;
 
@@ -295,7 +296,8 @@ impl GameState {
                     apply_teleport(&mut self.board_mut(), target, x, y).unwrap_or_else(|e| log_sink.error(e))
                 }
                 Action::Push { x, y, dir } => {
-                    apply_push(&mut self.board_mut(), x, y, dir).unwrap_or_else(|e| log_sink.error(e))
+                    self.resolve_move((x as usize, y as usize), dir);
+                    //apply_push(&mut self.board_mut(), x, y, dir).unwrap_or_else(|e| log_sink.error(e))
                 }
                 Action::Shift(cells) => {
                     apply_shift(&mut self.board_mut(), &cells).unwrap_or_else(|e| log_sink.error(e))
@@ -385,6 +387,96 @@ impl GameState {
         self.run_init();
     }
 
+    fn resolve_move(&mut self, from: (usize, usize), dir: Direction) -> bool {
+        // Get the target coords, if they're out of bounds then the move fails.
+        let target: Point = dir.from_point(from.0 as i64, from.1 as i64).into();
+        if !self.board().in_bounds((target.x, target.y)) { return false; }
+
+        if self.board().is_empty(target) {
+            // If it's empty, we can move in there; do so and return true:
+            self.board_mut().move_cell(from.into(), target);
+        } else if self.board().is_player(target) {
+            // Target cell contains player, who's pushable, so we'll recurse and see what happens:
+            if self.resolve_move((target.x as usize, target.y as usize), dir) {
+                self.board_mut().move_cell(from.into(), target);
+            }
+        } else {
+            // Otherwise, what enter response does the thing there have? We need to be able to call
+            // hooks on objects, so we can't hold a mut reference to the board going into this match
+            let id = {
+                if let Some(Tile::Object(b)) = self.board_mut().get(target.x as usize, target.y as usize) && let def = b.as_ref() {
+                    def.scripting.id
+                } else {
+                    unreachable!("moving into the player was handled above")
+                }
+            };
+
+            // Whether the player is what initiated the move directly. Matters for grab / swap
+            // let from_player = matches!(self.board().get(from.0, from.1), Some(Tile::Player));
+
+            // Call the target's bump hook and resolve whatever it did
+            let actions = self.scripts.run_bump(id, dir.opposite());
+            self.apply_actions(actions);
+
+            // First do things to try and call any hooks relevant:
+            // let actions = match resp {
+            //     // We block all moves, return false
+            //     EnterResponse::Block => { self.scripts.run_bump(id, dir.opposite()) }
+            //
+            //     // The player can grab things directly, so let's do that
+            //     EnterResponse::Grab if from_player => {
+            //         let a = self.scripts.run_grab(id);
+            //         self.board_mut().get_mut(target.0, target.1).take();
+            //         a
+            //     }
+            //
+            //     // Grabbables not from the player act as pushable, we need to recurse
+            //     EnterResponse::Grab => { self.resolve_move(target, dir); vec![] }
+            //
+            //     // Pushable if we're allowed to push that way recurses
+            //     EnterResponse::Push(p) if p.allows(dir) => { self.resolve_move(target, dir); vec![] }
+            //
+            //     // Pushable in a disallowed direction blocks
+            //     EnterResponse::Push(p) => { self.scripts.run_bump(id, dir.opposite()) }
+            //
+            //     // Swaps let the player swap places, but we should return false afterward because we
+            //     // haven't left the source cell empty. In practice this won't matter because right
+            //     // now we never recurse _into_ a player-source-cell, all moves are initiated by the
+            //     // player, but still.
+            //     EnterResponse::Swap if from_player => {
+            //         let mut board = self.board_mut();
+            //         let mover = board.get_mut(from.0, from.1).take();
+            //         let swapper = board.get_mut(target.0, target.1).take();
+            //         board.get_mut(target.0, target.1).replace(mover.unwrap());
+            //         board.get_mut(from.0, from.1).replace(swapper.unwrap());
+            //         vec![]
+            //     }
+            //
+            //     // Swaps in a chain are just normal pushable, recurse:
+            //     EnterResponse::Swap => { self.resolve_move(target, dir); vec![] }
+            //
+            //     // Squish just lets the mover overwrite, and always leaves the source cell empty:
+            //     EnterResponse::Squish => { self.board_mut().get_mut(from.0, from.1).take(); vec![] }
+            //
+            //     // Finally, hook, we need to call a hook and let it do its thing:
+            //     EnterResponse::Hook => { self.scripts.run_bump(id, dir.opposite()) }
+            // };
+
+            // If there were actions performed by the hooks, do them.
+            // self.apply_actions(actions);
+
+            // Now, check again if the target cell is empty. If it is, put the mover there. Also
+            // check that the source cell still contains something! It may have been teleported away.
+            if !self.board().is_empty(from.into()) && self.board().is_empty(target) {
+                self.board_mut().move_cell(from.into(), target);
+            }
+        }
+
+        // Either way, return whether the source cell is now empty, so calls up the chain
+        // can move into it (push chains)
+        self.board().is_empty(from.into())
+    }
+
     /// Attempts to move the player one cell in `dir`.
     ///
     /// The move is ignored if the target cell is out of bounds, or it is neither
@@ -399,80 +491,8 @@ impl GameState {
         if !self.board().in_bounds(target) {
             return;
         }
-        let (nx, ny) = (target.0 as usize, target.1 as usize);
 
-        // We need to be able to call hooks on objects, so we can't hold a mut reference to the
-        // board going into this match
-        let obj_data = {
-            if let Some(Tile::Object(b)) = self.board_mut().get(nx, ny) && let def = b.as_ref() {
-                Some((def.scripting.id, def.enter_response))
-            } else {
-                None
-            }
-        };
-
-        if let Some((id, enter_response)) = obj_data {
-            let actions = match enter_response {
-                EnterResponse::Block => {
-                    // Call the bump hook
-                    self.scripts.run_bump(id, dir.opposite())
-                }
-                EnterResponse::Grab => {
-                    // Call the hook to get the actions and then stamp the player on top
-                    let a = self.scripts.run_grab(id);
-                    {
-                        let mut board = self.board_mut();
-                        board.get_mut(player_loc.0, player_loc.1).take();
-                        board.get_mut(nx, ny).replace(Tile::Player);
-                    }
-                    a
-                }
-                EnterResponse::Push(pushable) => {
-                    // First, can we push?
-                    if self.board().can_push(nx, ny, dir) {
-                        // The player is pushable, so, this amounts to the same thing and saves a
-                        // couple replace()s
-                        self.board_mut().push(player_loc.0, player_loc.1, dir);
-                        vec![] // There's no push hook, just pushing doesn't call scripts
-                    } else {
-                        // This is actually not pushable in this way, so we're gonna bump instead:
-                        self.scripts.run_bump(id, dir.opposite())
-                    }
-                }
-                EnterResponse::Hook => {
-                    vec![] // TODO this hook needs to exist and work. It's documented in tile.rb. Has implications for push as well
-                    // plan: get rid of can_push in board. Make a board::pushes_into_hook or something, find the hook-enter
-                    // object at the end of this chain. Trying to push calls that, if there's no hook object then it pushes, if
-                    // that returns false then it bumps. If there is a hook object, call the hook, run the actions. If it _leaves
-                    // the cell empty,_ then call push. Otherwise bump.
-                    // Maybe have a pushresult enum or something that board::push returns, "hook(id, bumpid)" or "bump(id)" or "moved".
-                    // If the situation is: `@b++h` then moving to the east, the bumpid would be b (the thing you actually touched),
-                    // hook id would be h (the thing with the hook enterresponse). Board can identify object chains but not actually
-                    // call hooks.
-                }
-                EnterResponse::Swap => {
-                    let mut board = self.board_mut();
-                    // Swap the two
-                    let tgt = board.get_mut(nx, ny).replace(Tile::Player);
-                    *board.get_mut(player_loc.0, player_loc.1) = tgt;
-                    vec![]
-                }
-                EnterResponse::Squish => {
-                    let mut board = self.board_mut();
-                    // Stamp over it, squishing it
-                    board.get_mut(player_loc.0, player_loc.1).take();
-                    board.get_mut(nx, ny).replace(Tile::Player);
-                    vec![]
-                }
-            };
-
-            self.apply_actions(actions);
-        } else {
-            // There's not an object there, we can just move the player
-            let mut board = self.board_mut();
-            board.get_mut(player_loc.0, player_loc.1).take();
-            board.get_mut(nx, ny).replace(Tile::Player);
-        }
+        self.resolve_move(player_loc, dir);
 
         // Check if we actually moved
         let new_loc = self.board().player_pos();
diff --git a/kiln-core/src/script.rs b/kiln-core/src/script.rs
index f03b729..405e196 100644
--- a/kiln-core/src/script.rs
+++ b/kiln-core/src/script.rs
@@ -37,7 +37,7 @@ use crate::action::{Action, BoardAction, ScrollLine, SendArg, MOVE_COST};
 use crate::game::SAY_DURATION;
 use crate::log::LogLine;
 use crate::object_def::ObjectDef;
-use crate::utils::{Direction, LogSink, Hook, ObjectId};
+use crate::utils::{Direction, LogSink, Hook, ObjectId, Point};
 use rhai::{
     Array, CallFnOptions, Dynamic, Engine, ImmutableString, Module, NativeCallContext,
     Scope, AST,
@@ -48,7 +48,6 @@ use crate::api::object_info::ObjectInfo;
 use crate::api::player::PlayerWithPos;
 use crate::api::queue::ObjQueue;
 use crate::api::registry::Registry;
-use crate::builtin::BUILTIN_SOURCES;
 use color::Rgba8;
 use crate::glyph::parse_color;
 use crate::glyph::Glyph;
@@ -116,6 +115,8 @@ impl ScriptHost {
         Glyph::register(&mut engine, log_sink.clone());
         ObjQueue::register(&mut engine, log_sink.clone());
         Registry::register(&mut engine, log_sink.clone());
+        Direction::register(&mut engine, log_sink.clone());
+        Point::register(&mut engine, log_sink.clone());
 
         register_write_api(&mut engine, board_ref.clone(), log_sink.clone());
         register_global_constants(&mut engine, board_ref.clone(), player.clone());
diff --git a/kiln-core/src/scripts/crate.rhai b/kiln-core/src/scripts/crate.rhai
new file mode 100644
index 0000000..17e527e
--- /dev/null
+++ b/kiln-core/src/scripts/crate.rhai
@@ -0,0 +1,8 @@
+// Built-in script for the `crate` archetype (see kiln-core/src/builtin_scripts.rs).
+fn bump(me, dir) {
+    push(me.x, me.y, dir.opposite); // Try to clear our target cell
+    let tgt = dir.opposite.from_point(me.x, me.y);
+    // This will silently-nop if tgt is occupied, and it will evaluate that after the push
+    // (queue both right now, evaluate in that order after)
+    teleport(me.id, tgt.x, tgt.y);
+}
diff --git a/kiln-core/src/scripts/gem.rhai b/kiln-core/src/scripts/gem.rhai
index 2ba1770..f342950 100644
--- a/kiln-core/src/scripts/gem.rhai
+++ b/kiln-core/src/scripts/gem.rhai
@@ -3,7 +3,7 @@
 // A gem is a grabbable collectible: walking onto it (or pushing it into the
 // player) fires this `grab()` hook instead of blocking. We bump the player's gem
 // count and remove ourselves from the board.
-fn grab(me) {
+fn bump(me, _dir) {
     alter_gems(1);
     die();
 }
diff --git a/kiln-core/src/scripts/heart.rhai b/kiln-core/src/scripts/heart.rhai
index 7d951e1..98074ea 100644
--- a/kiln-core/src/scripts/heart.rhai
+++ b/kiln-core/src/scripts/heart.rhai
@@ -2,7 +2,7 @@
 //
 // A heart is a grabbable collectible: walking onto it fires `grab()` instead
 // of blocking. It restores 1 health and removes itself from the board.
-fn grab(me) {
+fn bump(me, _dir) {
     alter_health(1);
     die();
 }
diff --git a/kiln-core/src/scripts/key.rhai b/kiln-core/src/scripts/key.rhai
index e0e2862..0f05650 100644
--- a/kiln-core/src/scripts/key.rhai
+++ b/kiln-core/src/scripts/key.rhai
@@ -3,7 +3,7 @@
 // A gem is a grabbable collectible: walking onto it (or pushing it into the
 // player) fires this `grab()` hook instead of blocking. We bump the player's gem
 // count and remove ourselves from the board.
-fn grab(me) {
+fn bump(me, _dir) {
     let colors = [
         "red",
         "orange",
diff --git a/kiln-core/src/utils.rs b/kiln-core/src/utils.rs
index 6c06d31..a9fff18 100644
--- a/kiln-core/src/utils.rs
+++ b/kiln-core/src/utils.rs
@@ -1,9 +1,11 @@
 use std::cell::RefCell;
 use std::fmt::Display;
 use std::rc::Rc;
-use rhai::Dynamic;
+use rhai::{Dynamic, Engine};
 use serde::{Deserialize, Serialize};
+use crate::keys::Keyring;
 use crate::log::LogLine;
+use crate::script::Registerable;
 
 /// Which directions a solid may be pushed in.
 ///
@@ -121,10 +123,50 @@ impl Direction {
 
     /// Translate the given point in this direction
     pub fn from_point(self, x: i64, y: i64) -> (i64, i64) {
-        (x as i64 + self.dx(), y as i64 + self.dy())
+        (x + self.dx(), y + self.dy())
     }
 }
 
+impl Registerable for Direction {
+    fn register(engine: &mut Engine, _log_sink: LogSink) {
+        engine.register_type_with_name::<Direction>("Direction")
+            .register_get("opposite", |dir: &mut Direction| dir.opposite())
+            .register_fn("from_point", |dir: &mut Direction, x: i64, y: i64| Point::from(dir.from_point(x, y)));
+    }
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
+pub struct Point {
+    pub x: i64,
+    pub y: i64,
+}
+
+impl From<(i64, i64)> for Point {
+    fn from((x, y): (i64, i64)) -> Self { Self { x, y } }
+}
+
+impl From<(usize, usize)> for Point {
+    fn from((x, y): (usize, usize)) -> Self { Self { x: x as i64, y: y as i64 } }
+}
+
+impl Into<(i64, i64)> for Point {
+    fn into(self) -> (i64, i64) { (self.x, self.y) }
+}
+
+impl Display for Point {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "({}, {})", self.x, self.y)
+    }
+}
+
+impl Registerable for Point {
+    fn register(engine: &mut Engine, _log_sink: LogSink) {
+        engine.register_type_with_name::<Point>("Point")
+            .register_get("x", |p: &mut Point| p.x)
+            .register_get("y", |p: &mut Point| p.y);
+        engine.register_fn("xy", |x: i64, y: i64| Point::from((x, y)));
+    }
+}
 /// A value that can be stored in a board's script registry across board transitions.
 ///
 /// Restricted to primitive types that convert cleanly to and from `rhai::Dynamic`
diff --git a/maps/start.toml b/maps/start.toml
index 928f5b5..bac2668 100644
--- a/maps/start.toml
+++ b/maps/start.toml
@@ -8,7 +8,7 @@ start = "start"
 greeter = """
 fn init(me) {
     log(`hello from object — player at ${Player.x}, ${Player.y}`);
-    set_tile(2);   // change my glyph to ☻ — proves the write path
+    set_tile("☻");   // change my glyph — proves the write path
     say("Hello there,\\ntraveller!");
     log(`Player health: ${Player.health}`);
 }
@@ -37,15 +37,15 @@ fn init(me) {
     }
 }
 // move() costs 250 ms, so the object steps ~4 cells/sec no matter how often
-// tick() runs. Queue.length() avoids piling up moves; blocked() avoids walking
-// into a wall (or another object's already-queued move this tick).
+// tick() runs. The engine only calls tick() once this object's queue has drained,
+// so a whole dance can be queued up front without piling up.
 fn tick(me, dt) {
     move(East);
     move(South);
     move(North);
     move(East);
     say("Hey!", 0.5);
-    delay(me, 0.5);
+    me.delay(0.5);
     move(West);
     move(South);
     move(North);
@@ -159,7 +159,7 @@ fn bump(me, _dir) {
 yammerer = """
 fn tick(me, dt) {
     say("blahblahblah", 2.0);
-    delay(2);
+    delay(2.0);
 }
 """
 
@@ -175,8 +175,8 @@ fn tick(me, dt) {
 }
 """
 
-# A trigger script: no glyph, not solid — it just watches for the player stepping
-# onto its cell and logs. Triggers are placed via [[boards.NAME.triggers]].
+# A sensor script: no glyph, off the grid — it just watches for the player stepping
+# onto its cell and logs. Sensors are placed via [[boards.NAME.sensors]].
 tripwire = """
 fn enter(me, dir) {
     if Player.x == me.x && Player.y == me.y {
@@ -185,7 +185,7 @@ fn enter(me, dir) {
 }
 """
 
-[boards.start.map]
+[boards.start]
 name = "Starting Room"
 width = 60
 height = 25
@@ -193,23 +193,24 @@ height = 25
 # grass/dirt/stone/water floor is not representable with one floor attribute).
 floor = { biome = "grass" }
 
-# The single grid: all solids and most non-solids (terrain, the player, objects and
-# the portal). A space is always a transparent empty cell, so the floor shows through.
-[boards.start.grid]
-content = """
+# The grid holds every solid: terrain, crates, the player and scripted objects. A
+# space is a transparent empty cell, so the floor shows through. Portals and sensors
+# are *not* here — they sit alongside the grid (see the arrays further down), because
+# the player has to be able to share their cell.
+grid = """
 ############################################################
 #                                                          #
 #                                            o             #
 #                                           oS             #
 #                                                          #
-# 1                                                        #
+#                                                          #
 #                               )######(           B       #
 #                                     #                    #
-#             +++                     #         v          #
+#                                     #         v          #
 #                                     #                    #
 #                                           |              #
 #                                                          #
-#         V                  oo     G   -            @     #
+#         V                  oo         -            @     #
 #                                                   /#     #
 #                                                    t     #
 #                                                          #
@@ -223,52 +224,99 @@ content = """
 #                                                          #
 ############################################################
 """
-[boards.start.grid.palette]
-"#" = { kind = "wall",  tile = "#", fg = "#808080", bg = "#606060" }
-"+" = { kind = "banana", tile = "#", fg = "#808080", bg = "#606060" }  # unknown kind -> ErrorBlock demo
-"o" = { kind = "crate", tile = 254, fg = "#aaaaaa", bg = "#000000" }
-"-" = { kind = "hcrate", tile = 29, fg = "#aaaaaa", bg = "#000000" }
-"|" = { kind = "vcrate", tile = 18, fg = "#aaaaaa", bg = "#000000" }
-">" = { kind = "pusher_east" }
-"^" = { kind = "pusher_north" }
-"@" = { kind = "player" }
-"1" = { kind = "portal", name = "to_house", target_map = "house", target_entry = "from_start" }
-"G" = { kind = "object", tile = "#", fg = "#aa3333", bg = "#000000", solid = false, script_name = "greeter" }
-"V" = { kind = "object", tile = 1, fg = "#33aa33", bg = "#000000", script_name = "mover" }
-"M" = { kind = "object", tile = 15, fg = "#ffdd88", bg = "#000000", solid = true, name = "muffin", script_name = "muffin" }
-"B" = { kind = "object", tile = 240, fg = "#cc9944", bg = "#000000", solid = true, name = "noticeboard", script_name = "noticeboard" }
-"S" = { kind = "object", tile = 240, fg = "#cc9944", bg = "#000000", solid = true, name = "shifter", script_name = "shifter" }
-"/" = { kind = "spinner_cw" }
-"t" = { kind = "gem" }
-"v" = { kind = "transporter_south" }
-")" = { kind = "transporter_east" }
-"(" = { kind = "transporter_west" }
+[boards.start.palette]
+"#" = { type = "builtin", kind = "wall",   tile = "#", fg = "#808080", bg = "#606060" }
+"o" = { type = "builtin", kind = "crate",  tile = 254, fg = "#aaaaaa", bg = "#000000" }
+"-" = { type = "builtin", kind = "hcrate", tile = 29,  fg = "#aaaaaa", bg = "#000000" }
+"|" = { type = "builtin", kind = "vcrate", tile = 18,  fg = "#aaaaaa", bg = "#000000" }
+">" = { type = "builtin", kind = "pusher_east" }
+"^" = { type = "builtin", kind = "pusher_north" }
+"/" = { type = "builtin", kind = "spinner_cw" }
+"t" = { type = "builtin", kind = "gem" }
+"v" = { type = "builtin", kind = "transporter_south" }
+")" = { type = "builtin", kind = "transporter_east" }
+"(" = { type = "builtin", kind = "transporter_west" }
+"@" = { type = "player" }
 
-# Triggers: invisible, non-solid, script-only objects placed off the grid. This one
-# watches for the player and logs when they reach its cell.
-[[boards.start.triggers]]
+# The dancer: walks a fixed loop, and teleports back to where it started if the
+# board Registry remembers a previous position.
+[boards.start.palette.V]
+type = "object"
+script = "mover"
+enter = "block"
+tile = 1
+fg = "#33aa33"
+bg = "#000000"
+
+[boards.start.palette.M]
+type = "object"
+script = "muffin"
+name = "muffin"
+enter = "block"
+tile = 15
+fg = "#ffdd88"
+bg = "#000000"
+
+[boards.start.palette.B]
+type = "object"
+script = "noticeboard"
+name = "noticeboard"
+enter = "block"
+tile = 240
+fg = "#cc9944"
+bg = "#000000"
+
+[boards.start.palette.S]
+type = "object"
+script = "shifter"
+name = "shifter"
+enter = "block"
+tile = 240
+fg = "#cc9944"
+bg = "#000000"
+
+[[boards.start.portals]]
+x = 2
+y = 5
+name = "to_house"
+target_board = "house"
+target_name = "from_start"
+
+# The greeter is a sensor, not a grid object: it is visible but does not block, so
+# stepping onto it fires its `enter` hook. (A non-solid grid object no longer
+# exists — every object in the grid is solid.)
+[[boards.start.sensors]]
+x = 36
+y = 12
+script = "greeter"
+draw_layer = "Below"   # capitalized: DrawLayer's variants are not renamed
+glyph = { tile = "#", fg = "#aa3333", bg = "#000000" }
+
+# An invisible tripwire, deliberately placed *under* the hcrate at (40,12): you have
+# to shove the crate west before you can stand here and set it off.
+[[boards.start.sensors]]
 x = 40
 y = 12
-script_name = "tripwire"
+script = "tripwire"
 
-[boards.house.map]
+[boards.house]
 name = "The House"
 width = 60
 height = 25
 dark = true
 
-# A single fixed floor glyph across the whole board.
-floor = { tile = 176, fg = "#888888", bg = "#444444" }
+# A single fixed floor glyph across the whole board. There are no light sources
+# here, so the board is lit only by the player's own torch (SIGHT_RADIUS, 10).
+floor = { glyph = { tile = 176, fg = "#888888", bg = "#444444" } }
 
-# The single grid: terrain, the player, objects and the return portal.
-[boards.house.grid]
-content = """
+# The grid: terrain, the player and objects. The return portal is off-grid, below.
+grid = """
 ############################################################
 #                                                          #
 # K                        ###F###                         #
 #                          #     #                         #
 #                          #######                         #
-#                                                       1  #
+#                                                          #
 #                                                          #
 #       #########      T                                   #
 #       #       #                T                         #
@@ -289,12 +337,50 @@ content = """
 #                                                          #
 ############################################################
 """
-[boards.house.grid.palette]
-"#" = { kind = "wall", tile = 178, fg = "#888888", bg = "#555555" }
-"@" = { kind = "player" }
-"1" = { kind = "portal", name = "from_start", target_map = "start", target_entry = "to_house" }
-"K" = { kind = "object", tile = 240, fg = "#aa7733", bg = "#3d1c00", solid = true, name = "bookshelf", script_name = "bookshelf" }
-"F" = { kind = "object", tile = 15, fg = "#ff8800", bg = "#220000", solid = true, name = "fireplace", script_name = "fireplace" }
-"C" = { kind = "object", tile = 240, fg = "#ccaa44", bg = "#222200", solid = true, name = "chest", script_name = "chest" }
-"T" = { kind = "object", tile = 1, fg = "#99ff44", bg = "#000000", solid = true, script_name = "yammerer" }
+[boards.house.palette]
+"#" = { type = "builtin", kind = "wall", tile = 178, fg = "#888888", bg = "#555555" }
+"@" = { type = "player" }
+
+[boards.house.palette.K]
+type = "object"
+script = "bookshelf"
+name = "bookshelf"
+enter = "block"
+tile = 240
+fg = "#aa7733"
+bg = "#3d1c00"
+
+[boards.house.palette.F]
+type = "object"
+script = "fireplace"
+name = "fireplace"
+enter = "block"
+tile = 15
+fg = "#ff8800"
+bg = "#220000"
+
+[boards.house.palette.C]
+type = "object"
+script = "chest"
+name = "chest"
+enter = "block"
+tile = 240
+fg = "#ccaa44"
+bg = "#222200"
+
+# Seven of these, so it stays unnamed — object names must be board-unique.
+[boards.house.palette.T]
+type = "object"
+script = "yammerer"
+enter = "block"
+tile = 1
+fg = "#99ff44"
+bg = "#000000"
+
+[[boards.house.portals]]
+x = 56
+y = 5
+name = "from_start"
+target_board = "start"
+target_name = "to_house"