diff --git a/dev-assets/doodads/crumbly-floor/crumbly-floor.js b/dev-assets/doodads/crumbly-floor/crumbly-floor.js
index 97c2be0..c7bdf08 100644
--- a/dev-assets/doodads/crumbly-floor/crumbly-floor.js
+++ b/dev-assets/doodads/crumbly-floor/crumbly-floor.js
@@ -1,6 +1,6 @@
 // Crumbly Floor.
 function main() {
-	Self.SetHitbox(0, 0, 65, 7);
+	Self.SetHitbox(0, 0, 98, 11);
 
 	Self.AddAnimation("shake", 100, ["shake1", "shake2", "floor", "shake1", "shake2", "floor"]);
 	Self.AddAnimation("fall", 100, ["fall1", "fall2", "fall3", "fall4"]);
diff --git a/dev-assets/doodads/crumbly-floor/fall1.png b/dev-assets/doodads/crumbly-floor/fall1.png
index bc9710c..fdc1616 100644
Binary files a/dev-assets/doodads/crumbly-floor/fall1.png and b/dev-assets/doodads/crumbly-floor/fall1.png differ
diff --git a/dev-assets/doodads/crumbly-floor/fall2.png b/dev-assets/doodads/crumbly-floor/fall2.png
index 1524b6d..ac135c2 100644
Binary files a/dev-assets/doodads/crumbly-floor/fall2.png and b/dev-assets/doodads/crumbly-floor/fall2.png differ
diff --git a/dev-assets/doodads/crumbly-floor/fall3.png b/dev-assets/doodads/crumbly-floor/fall3.png
index 5b05d93..cad059d 100644
Binary files a/dev-assets/doodads/crumbly-floor/fall3.png and b/dev-assets/doodads/crumbly-floor/fall3.png differ
diff --git a/dev-assets/doodads/crumbly-floor/fall4.png b/dev-assets/doodads/crumbly-floor/fall4.png
index 97e8ee0..11f6c98 100644
Binary files a/dev-assets/doodads/crumbly-floor/fall4.png and b/dev-assets/doodads/crumbly-floor/fall4.png differ
diff --git a/dev-assets/doodads/crumbly-floor/fallen.png b/dev-assets/doodads/crumbly-floor/fallen.png
index dd5e57f..6c16dd0 100644
Binary files a/dev-assets/doodads/crumbly-floor/fallen.png and b/dev-assets/doodads/crumbly-floor/fallen.png differ
diff --git a/dev-assets/doodads/crumbly-floor/floor.png b/dev-assets/doodads/crumbly-floor/floor.png
index f89f16e..c592c09 100644
Binary files a/dev-assets/doodads/crumbly-floor/floor.png and b/dev-assets/doodads/crumbly-floor/floor.png differ
diff --git a/dev-assets/doodads/crumbly-floor/shake1.png b/dev-assets/doodads/crumbly-floor/shake1.png
index 4881adf..b59c251 100644
Binary files a/dev-assets/doodads/crumbly-floor/shake1.png and b/dev-assets/doodads/crumbly-floor/shake1.png differ
diff --git a/dev-assets/doodads/crumbly-floor/shake2.png b/dev-assets/doodads/crumbly-floor/shake2.png
index 42e770d..83723ef 100644
Binary files a/dev-assets/doodads/crumbly-floor/shake2.png and b/dev-assets/doodads/crumbly-floor/shake2.png differ
diff --git a/dev-assets/doodads/doors/build.sh b/dev-assets/doodads/doors/build.sh
index 52d6e18..384d486 100755
--- a/dev-assets/doodads/doors/build.sh
+++ b/dev-assets/doodads/doors/build.sh
@@ -18,13 +18,9 @@ doodad convert -t "Yellow Door" yellow-closed.png yellow-unlocked.png yellow-rig
 doodad edit-doodad -q --tag color=yellow door-yellow.doodad
 doodad install-script colored-door.js door-yellow.doodad
 
-# doodad convert -t "Green Door" green1.png green2.png door-green.doodad
-# doodad edit-doodad -q --tag color=green door-green.doodad
-# doodad install-script locked-door.js door-green.doodad
-#
-# doodad convert -t "Yellow Door" yellow1.png yellow2.png door-yellow.doodad
-# doodad edit-doodad -q --tag color=yellow door-yellow.doodad
-# doodad install-script locked-door.js door-yellow.doodad
+doodad convert -t "Small Key Door" small-closed.png small-unlocked.png small-right.png small-left.png small-key-door.doodad
+doodad edit-doodad -q --tag color=small small-key-door.doodad
+doodad install-script colored-door.js small-key-door.doodad
 
 doodad convert -t "Red Key" red-key.png key-red.doodad
 doodad edit-doodad -q --tag color=red key-red.doodad
@@ -42,7 +38,11 @@ doodad convert -t "Yellow Key" yellow-key.png key-yellow.doodad
 doodad edit-doodad -q --tag color=yellow key-yellow.doodad
 doodad install-script keys.js key-yellow.doodad
 
+doodad convert -t "Small Key" small-key.png small-key.doodad
+doodad edit-doodad -q --tag color=small small-key.doodad
+doodad install-script keys.js small-key.doodad
+
 doodad convert -t "Electric Door" electric{1,2,3,4}.png door-electric.doodad
 doodad install-script electric-door.js door-electric.doodad
 
-cp door-*.doodad key-*.doodad ../../../assets/doodads/
+cp door-*.doodad key-*.doodad small-*.doodad ../../../assets/doodads/
diff --git a/dev-assets/doodads/doors/colored-door.js b/dev-assets/doodads/doors/colored-door.js
index eaa1bcf..0bfba60 100644
--- a/dev-assets/doodads/doors/colored-door.js
+++ b/dev-assets/doodads/doors/colored-door.js
@@ -1,6 +1,6 @@
 function main() {
 	var color = Self.GetTag("color");
-	var keyname = "key-" + color + ".doodad";
+	var keyname = color === "small" ? "small-key.doodad" : "key-" + color + ".doodad";
 
 	// Layers in the doodad image.
 	var layer = {
@@ -46,7 +46,12 @@ function main() {
 			if (e.Settled) {
 				unlocked = true;
 				Self.ShowLayer(enterSide < 0 ? layer.right : layer.left);
-				Sound.Play("unlock.wav")
+				Sound.Play("unlock.wav");
+
+				// If a Small Key door, consume a small key.
+				if (color === "small") {
+					e.Actor.RemoveItem(keyname, 1)
+				}
 			}
 		}
 	});
diff --git a/dev-assets/doodads/doors/keys.js b/dev-assets/doodads/doors/keys.js
index 00cc6d7..593b871 100644
--- a/dev-assets/doodads/doors/keys.js
+++ b/dev-assets/doodads/doors/keys.js
@@ -1,10 +1,11 @@
 function main() {
 	var color = Self.GetTag("color");
+	var quantity = color === "small" ? 1 : 0;
 
 	Events.OnCollide(function(e) {
 		if (e.Settled) {
 			Sound.Play("item-get.wav")
-			e.Actor.AddItem(Self.Filename, 0);
+			e.Actor.AddItem(Self.Filename, quantity);
 			Self.Destroy();
 		}
 	})
diff --git a/dev-assets/doodads/doors/small-closed.png b/dev-assets/doodads/doors/small-closed.png
new file mode 100644
index 0000000..b97ae46
Binary files /dev/null and b/dev-assets/doodads/doors/small-closed.png differ
diff --git a/dev-assets/doodads/doors/small-key.png b/dev-assets/doodads/doors/small-key.png
new file mode 100644
index 0000000..11e4eca
Binary files /dev/null and b/dev-assets/doodads/doors/small-key.png differ
diff --git a/dev-assets/doodads/doors/small-left.png b/dev-assets/doodads/doors/small-left.png
new file mode 100644
index 0000000..273786f
Binary files /dev/null and b/dev-assets/doodads/doors/small-left.png differ
diff --git a/dev-assets/doodads/doors/small-right.png b/dev-assets/doodads/doors/small-right.png
new file mode 100644
index 0000000..4f55056
Binary files /dev/null and b/dev-assets/doodads/doors/small-right.png differ
diff --git a/dev-assets/doodads/doors/small-unlocked.png b/dev-assets/doodads/doors/small-unlocked.png
new file mode 100644
index 0000000..5596796
Binary files /dev/null and b/dev-assets/doodads/doors/small-unlocked.png differ
diff --git a/pkg/cheats.go b/pkg/cheats.go
index 07c7cf2..8ba5909 100644
--- a/pkg/cheats.go
+++ b/pkg/cheats.go
@@ -72,6 +72,7 @@ func (c Command) cheatCommand(d *Doodle) bool {
 			playScene.Player.AddItem("key-blue.doodad", 0)
 			playScene.Player.AddItem("key-green.doodad", 0)
 			playScene.Player.AddItem("key-yellow.doodad", 0)
+			playScene.Player.AddItem("small-key.doodad", 99)
 			d.Flash("Given all keys to the player character.")
 		} else {
 			d.Flash("Use this cheat in Play Mode to get all colored keys.")
diff --git a/pkg/play_inventory.go b/pkg/play_inventory.go
index 8fa18ff..8d69245 100644
--- a/pkg/play_inventory.go
+++ b/pkg/play_inventory.go
@@ -1,6 +1,8 @@
 package doodle
 
 import (
+	"fmt"
+
 	"git.kirsle.net/apps/doodle/pkg/balance"
 	"git.kirsle.net/apps/doodle/pkg/doodads"
 	"git.kirsle.net/apps/doodle/pkg/uix"
@@ -52,70 +54,77 @@ func (s *PlayScene) setupInventoryHud() {
 // computeInventory adjusts the inventory HUD when the player's inventory changes.
 func (s *PlayScene) computeInventory() {
 	items := s.Player.ListItems()
-	if len(items) != len(s.invenItems) {
-		// Inventory has changed! See which doodads we have
-		// and which we need to load.
-		var seen = map[string]interface{}{}
-		for _, filename := range items {
-			seen[filename] = nil
 
-			if _, ok := s.invenDoodads[filename]; !ok {
-				// Cache miss. Load the doodad here.
-				doodad, err := doodads.LoadFile(filename)
-				if err != nil {
-					s.d.Flash("Inventory item '%s' error: %s", filename, err)
-					continue
-				}
+	// Inventory has changed! See which doodads we have
+	// and which we need to load.
+	var seen = map[string]interface{}{}
+	for _, filename := range items {
+		seen[filename] = nil
 
-				canvas := uix.NewCanvas(doodad.ChunkSize(), false)
-				canvas.LoadDoodad(doodad)
-				canvas.Resize(render.NewRect(
-					doodad.ChunkSize(), doodad.ChunkSize(),
-				))
-				s.invenFrame.Pack(canvas, ui.Pack{
-					Side: ui.W,
-
-					// TODO: work around a weird padding bug. item had too
-					// tall a top margin when added to the inventory frame!
-					PadX: 8,
-				})
-				s.invenDoodads[filename] = canvas
+		if _, ok := s.invenDoodads[filename]; !ok {
+			// Cache miss. Load the doodad here.
+			doodad, err := doodads.LoadFile(filename)
+			if err != nil {
+				s.d.Flash("Inventory item '%s' error: %s", filename, err)
+				continue
 			}
 
-			s.invenDoodads[filename].Show()
+			canvas := uix.NewCanvas(doodad.ChunkSize(), false)
+			canvas.SetBackground(render.RGBA(1, 0, 0, 0))
+			canvas.LoadDoodad(doodad)
+			canvas.Resize(render.NewRect(
+				doodad.ChunkSize(), doodad.ChunkSize(),
+			))
+			s.invenFrame.Pack(canvas, ui.Pack{
+				Side: ui.W,
+
+				// TODO: work around a weird padding bug. item had too
+				// tall a top margin when added to the inventory frame!
+				PadX: 8,
+			})
+			s.invenDoodads[filename] = canvas
 		}
 
-		// Hide any doodad that used to be in the inventory but now is not.
-		for filename, canvas := range s.invenDoodads {
-			if _, ok := seen[filename]; !ok {
-				canvas.Hide()
-			}
-		}
-
-		// Recompute the size of the inventory frame.
-		// TODO: this works around a bug in ui.Frame, at the bottom of
-		// compute_packed, a frame Resize's itself to fit the children but this
-		// trips the "manually set size" boolean... packing more items after a
-		// computer doesn't resize the frame. So here, we resize-auto it to
-		// reset that boolean so the next compute, picks the right size.
-		s.invenFrame.Configure(ui.Config{
-			AutoResize: true,
-			Width:      1,
-			Height:     1,
-		})
-		s.invenFrame.Compute(s.d.Engine)
-
-		// If we removed all items, hide the frame.
-		if len(items) == 0 {
-			s.invenFrame.Hide()
+		// For items with >1 quantity, show the quantity in the corner.
+		if qty := s.Player.HasItem(filename); qty > 0 {
+			s.invenDoodads[filename].CornerLabel = fmt.Sprintf("%d", qty)
 		} else {
-			s.invenFrame.Show()
+			s.invenDoodads[filename].CornerLabel = ""
 		}
 
-		// Cache the item list so we don't run the above logic every single tick.
-		s.invenItems = items
+		s.invenDoodads[filename].Show()
 	}
 
+	// Hide any doodad that used to be in the inventory but now is not.
+	for filename, canvas := range s.invenDoodads {
+		if _, ok := seen[filename]; !ok {
+			canvas.Hide()
+		}
+	}
+
+	// Recompute the size of the inventory frame.
+	// TODO: this works around a bug in ui.Frame, at the bottom of
+	// compute_packed, a frame Resize's itself to fit the children but this
+	// trips the "manually set size" boolean... packing more items after a
+	// computer doesn't resize the frame. So here, we resize-auto it to
+	// reset that boolean so the next compute, picks the right size.
+	s.invenFrame.Configure(ui.Config{
+		AutoResize: true,
+		Width:      1,
+		Height:     1,
+	})
+	s.invenFrame.Compute(s.d.Engine)
+
+	// If we removed all items, hide the frame.
+	if len(items) == 0 {
+		s.invenFrame.Hide()
+	} else {
+		s.invenFrame.Show()
+	}
+
+	// Cache the item list so we don't run the above logic every single tick.
+	s.invenItems = items
+
 	// Compute the inventory frame so it positions and wraps the items.
 	s.screen.Compute(s.d.Engine)
 }
diff --git a/pkg/uix/actor.go b/pkg/uix/actor.go
index 06a96b4..1756b56 100644
--- a/pkg/uix/actor.go
+++ b/pkg/uix/actor.go
@@ -207,7 +207,11 @@ func (a *Actor) SetNoclip(v bool) {
 // Item name is usually the doodad filename.
 func (a *Actor) AddItem(itemName string, quantity int) {
 	a.muInventory.Lock()
-	a.inventory[itemName] = quantity
+	if _, ok := a.inventory[itemName]; ok {
+		a.inventory[itemName] += quantity
+	} else {
+		a.inventory[itemName] = quantity
+	}
 	a.muInventory.Unlock()
 }
 
diff --git a/pkg/uix/canvas.go b/pkg/uix/canvas.go
index dbdc214..a4e1fe4 100644
--- a/pkg/uix/canvas.go
+++ b/pkg/uix/canvas.go
@@ -31,6 +31,10 @@ type Canvas struct {
 	Scrollable bool // Cursor keys will scroll the viewport of this canvas.
 	Zoom       int  // Zoom level on the canvas.
 
+	// Custom label to place in the lower-right corner of the canvas.
+	// Used for e.g. the quantity badge on Inventory items.
+	CornerLabel string
+
 	// Selected draw tool/mode, default Pencil, for editable canvases.
 	Tool      drawtool.Tool
 	BrushSize int // thickness of selected brush
diff --git a/pkg/uix/canvas_present.go b/pkg/uix/canvas_present.go
index aadef58..741e7af 100644
--- a/pkg/uix/canvas_present.go
+++ b/pkg/uix/canvas_present.go
@@ -152,6 +152,24 @@ func (w *Canvas) Present(e render.Engine, p render.Point) {
 	w.presentStrokes(e)
 	w.presentCursor(e)
 
+	// Custom label in the canvas corner? (e.g. for Inventory item counts)
+	if w.CornerLabel != "" {
+		label := ui.NewLabel(ui.Label{
+			Text: w.CornerLabel,
+			Font: render.Text{
+				FontFilename: balance.ShellFontFilename,
+				Size:         balance.ShellFontSizeSmall,
+				Color:        render.White,
+			},
+		})
+		label.SetBackground(render.RGBA(0, 0, 50, 150))
+		label.Compute(e)
+		label.Present(e, render.Point{
+			X: p.X + S.W - label.Size().W - w.BoxThickness(1),
+			Y: p.Y + S.H - label.Size().H - w.BoxThickness(1),
+		})
+	}
+
 	// XXX: Debug, show label in canvas corner.
 	if balance.DebugCanvasLabel {
 		rows := []string{