diff --git a/NeutTower.dsk b/NeutTower.dsk
index fee1824..32bbc2c 100644
Binary files a/NeutTower.dsk and b/NeutTower.dsk differ
diff --git a/game/boop.fnl b/game/boop.fnl
index 66becbb..42b2f27 100644
--- a/game/boop.fnl
+++ b/game/boop.fnl
@@ -18,8 +18,5 @@
     [:bne :sample]]
     (vm:drop) (vm:drop))
 
-(var noisebytes "")
-(for [i 0 0x40] (set noisebytes (.. noisebytes (string.char (math.random 0 255)))))
-(vm.code:append :noise [:bytes noisebytes])
-(vm:word :snd-explode 0x40 :lit :noise :blipmem)
+(vm:word :snd-explode 0x40 :lit :randombytes :blipmem)
 
diff --git a/game/defs.fnl b/game/defs.fnl
index 4264781..e74a55a 100644
--- a/game/defs.fnl
+++ b/game/defs.fnl
@@ -116,6 +116,19 @@
     [:sta vm.TOPH :x]
     [:sta :0xc010]])
 
+; "random" numbers
+; this is used only for cosmetic purposes and short noise generation, so we can get away
+; with just including a short table of random digits rather than implementing our own
+; pseudorandom number generator
+(var randombytes "")
+(for [i 0 0x40] (set randombytes (.. randombytes (string.char (math.random 0 255)))))
+(vm.code:append :randombytes [:bytes randombytes])
+(vm:var :irandom [:db 0])
+(vm:word :rnd
+  :irandom :bget
+  :dup 1 :+ 0x3f :& :irandom :bset
+  :lit :randombytes :+ :bget)
+
 ; 20x12 means full map is 240 bytes - we have an extra 16 bytes at the end for metadata
 (fn append-map [map org label]
   (org:append
@@ -162,11 +175,10 @@
   (table.insert result :dismiss-dialog)
   result)
 
-(local itile
-  (let [tilelist (tiles.loadgfx tiles.fn-tiles)]
-    (fn [label] (tiles.find-itile tilelist label))))
+(local tilelist (tiles.loadgfx tiles.fn-tiles))
+(fn itile [label] (tiles.find-itile tilelist label))
 
 (set vm.code org.code)
 
-{: vm : prg : mapw : maph : mon : org : achar : astr : style : rot8l : deflevel : say : say-runon : itile : controlstate}
+{: vm : prg : mapw : maph : mon : org : achar : astr : style : rot8l : deflevel : say : say-runon : itile : tilelist : controlstate}
 
diff --git a/game/init.fnl b/game/init.fnl
index c64a257..ab22a9f 100644
--- a/game/init.fnl
+++ b/game/init.fnl
@@ -27,7 +27,7 @@
 
 (vm:var :tick-count)
 (vm:word :handle-key :tick :read-key :player-key :hide-footer)
-(vm:word :tick :map-specific-tick :tick-count :get 1 :+ :tick-count :set :player-redraw)
+(vm:word :tick :map-specific-tick :tick-count :get 1 :+ :tick-count :set :player-redraw :rnd :drop)
 
 (vm:var :next-level 0)
 (vm:word :load-next-level :next-level :get :dup (vm:if [:load-level 0 :next-level :set] [:drop]))
diff --git a/game/level5.fnl b/game/level5.fnl
index 10d844f..9afd062 100644
--- a/game/level5.fnl
+++ b/game/level5.fnl
@@ -1,11 +1,16 @@
-(local {: deflevel : say : itile : controlstate} (require :game.defs))
+(local {: deflevel : say : itile : controlstate : tilelist} (require :game.defs))
 (local {: ev} (require :game.entity))
 (local tile (require :game.tiles))
 (local {: walkable : neutable : debris : sittable} tile.flag-to-bit)
 (local level (deflevel "game/map5.json" :level5))
 (local vm level.vm)
 
-(vm:word :randomgarbage (itile :broken-table))
+(vm.code:append :debristiles)
+(each [itile tiledef (ipairs tilelist)]
+  (when tiledef.flags.debris
+    (vm.code:append [:db (tile.encode-itile itile)])))
+(vm:word :randomgarbage :rnd 0x03 :& :lit :debristiles :+ :bget)
+
 (vm:var :doortimer 0)
 (vm:word :start-doortimer 0x10 :doortimer :set)
 (vm:word :doortimer-tick
diff --git a/game/map6.json b/game/map6.json
index 7f89dd3..804e237 100644
--- a/game/map6.json
+++ b/game/map6.json
@@ -1 +1 @@
-{"neut":{"y":1,"x":5},"map":"210261616161616161616161812261616161E1614161C2C081C0C0C0C0C0C0C0C0C001C081C0C0622161E04384C0C0C043C0C0C043C0C0C0848201612102616161C0C061610281026161C0C0616161612161C2C0C0C0C061E2C0C0C0A261C0C0C0C0E2612161E003C0C0C061C0C0C0C08261C0C0C003E06121026161C0C0C061E08282E2E061C0C0C06161612161C2C0C0C0C06103C0C0C02361C0C0C0C0C2614161E003C0C0C0616102C1026161C0C0C003E06121026184C0C0C0C043C043C063C0C0C0846161612161E081C0C0C0C0C0C0C0C0C0C0C0C081C083612161612261816161616161616161616161616161","loadword":"","tickword":"","jaye":{"y":2,"x":6},"gord-following":true,"moveword":"","objects":[{"x":3,"link":6,"func":"c4","linkword":"linkloop","name":"","y":10},{"x":5,"link":3,"func":"keypad2","linkword":"","name":"","y":10},{"x":5,"func":"door","linkword":"","name":"","y":11},{"x":11,"func":"door","linkword":"","name":"","y":9},{"x":13,"link":17,"func":"c9","linkword":"linkloop","name":"","y":6},{"x":9,"link":5,"func":"c8","linkword":"linkloop","name":"","y":6},{"link":23,"x":11,"y":4,"name":"","linkword":"","func":"switch"},{"x":3,"link":1,"func":"c3","linkword":"linkloop","name":"","y":7},{"x":3,"link":8,"func":"c2","linkword":"linkloop","name":"","y":4},{"x":3,"link":23,"func":"c1","linkword":"linkloop","name":"","y":2},{"x":4,"func":"door","linkword":"","name":"","y":2},{"x":4,"link":11,"func":"keypad1","linkword":"","name":"","y":3},{"x":4,"link":4,"func":"scan","linkword":"","name":"","y":1},{"x":17,"func":"door","linkword":"","name":"","y":2},{"x":17,"link":14,"func":"keypad3","linkword":"","name":"","y":3},{"x":19,"func":"rexx","linkword":"","name":"","y":2},{"x":19,"link":18,"func":"c5","linkword":"linkloop","name":"","y":4},{"x":19,"link":19,"func":"c6","linkword":"linkloop","name":"","y":7},{"x":19,"link":10,"func":"c7","linkword":"linkloop","name":"firewall","y":10},{"x":19,"link":19,"func":"switch","linkword":"","name":"","y":12},{"x":17,"link":22,"func":"keypad4","linkword":"","name":"","y":10},{"x":17,"func":"door","linkword":"","name":"","y":11},{"x":15,"link":9,"func":"cx","linkword":"linkloop","name":"","y":11},{"x":14,"link":25,"func":"scan","linkword":"","name":"","y":12},{"x":13,"linkentity":"","func":"exitdoor","linkword":"endgame","name":"","y":12}]}
\ No newline at end of file
+{"neut":{"y":1,"x":5},"map":"210261616161616161616161812261616161E1614161C2C081C0C0C0C0C0C0C0C0C0E0C081C0C0622161E04384C0C0C043C0C0C043C0C0C0848201612102616161C0C061610281026161C0C0616161612161C2C0C0C0C061E2C0C0C0A261C0C0C0C0E2612161E003C0C0C061C0C0C0C08261C0C0C003E06121026161C0C0C061E08282E2E061C0C0C06161612161C2C0C0C0C06103C0C0C02361C0C0C0C0C2614161E003C0C0C0616102C1026161C0C0C003E06121026184C0C0C0C043C043C063C0C0C0846161612161E081C0C0C0C0C0C0C0C0C0C0C0C081C083612161612261816161616161616161616161616161","loadword":"","tickword":"","jaye":{"y":2,"x":6},"gord-following":true,"moveword":"","objects":[{"link":6,"y":10,"func":"c4","name":"","linkword":"linkloop","x":3},{"link":3,"y":10,"func":"keypad2","name":"","linkword":"","x":5},{"x":5,"func":"door","y":11,"linkword":"","name":""},{"x":11,"func":"door","y":9,"linkword":"","name":""},{"link":17,"y":6,"func":"c9","name":"","linkword":"linkloop","x":13},{"link":5,"y":6,"func":"c8","name":"","linkword":"linkloop","x":9},{"x":11,"func":"switch","y":4,"linkword":"","name":"","link":23},{"link":1,"y":7,"func":"c3","name":"","linkword":"linkloop","x":3},{"link":8,"y":4,"func":"c2","name":"","linkword":"linkloop","x":3},{"link":23,"y":2,"func":"c1","name":"","linkword":"linkloop","x":3},{"x":4,"func":"door","y":2,"linkword":"","name":""},{"link":11,"y":3,"func":"keypad1","name":"","linkword":"","x":4},{"link":4,"y":1,"func":"scan","name":"","linkword":"","x":4},{"x":17,"func":"door","y":2,"linkword":"","name":""},{"link":14,"y":3,"func":"keypad3","name":"","linkword":"","x":17},{"x":19,"func":"rexx","y":2,"linkword":"","name":""},{"link":18,"y":4,"func":"c5","name":"","linkword":"linkloop","x":19},{"link":19,"y":7,"func":"c6","name":"","linkword":"linkloop","x":19},{"link":10,"y":10,"func":"c7","name":"firewall","linkword":"linkloop","x":19},{"link":19,"y":12,"func":"switch","name":"","linkword":"","x":19},{"link":22,"y":10,"func":"keypad4","name":"","linkword":"","x":17},{"x":17,"func":"door","y":11,"linkword":"","name":""},{"link":9,"y":11,"func":"cx","name":"","linkword":"linkloop","x":15},{"link":25,"y":12,"func":"scan","name":"","linkword":"","x":14},{"x":13,"linkentity":"","func":"exitdoor","y":12,"linkword":"endgame","name":""}]}
\ No newline at end of file
diff --git a/game/tiles.fnl b/game/tiles.fnl
index bd7aa73..9d73a98 100644
--- a/game/tiles.fnl
+++ b/game/tiles.fnl
@@ -53,14 +53,16 @@
 (fn encode-yx [xy]
   (if xy (bit.bor (bit.lshift (- xy.y 1) 8) (- xy.x 1)) 0xffff))
 
+(fn encode-itile [itile]
+  (bit.bor (bit.lshift (bit.band (- itile 1) 0x07) 5) (bit.rshift (bit.band (- itile 1) 0xf8) 3)))
+
 (fn find-itile [tiles label ?itilenext]
   (local itile (or ?itilenext 1))
   (local tile (. tiles itile))
   (assert (not= tile nil) (.. "No such tile " label))
-  (if (= tile.label label)
-      (bit.bor (bit.lshift (bit.band (- itile 1) 0x07) 5) (bit.rshift (bit.band (- itile 1) 0xf8) 3))
+  (if (= tile.label label) (encode-itile itile)
     (find-itile tiles label (+ itile 1))))
 
 {: loadgfx : savegfx : appendtiles : appendgfx : flags : flag-to-bit : find-itile
- : fn-tiles : fn-portraits : fn-font : encode-yx}
+ : fn-tiles : fn-portraits : fn-font : encode-yx : encode-itile}