diff --git a/coffee/bot.coffee b/coffee/bot.coffee
index f415a36..a09a5d6 100644
--- a/coffee/bot.coffee
+++ b/coffee/bot.coffee
@@ -408,11 +408,11 @@ class Bot extends Pushable
                 if world.isUnoccupiedPos @position.plus @getDir()  # forward will be empty 
                     if world.isOccupiedPos @position.plus @getDir().minus @getUp() # below forward is solid
                         occupant = world.getOccupantAtPos @position.plus @getDir().minus @getUp() 
-                        if occupant == null or not occupant.isSlippery()
+                        if not occupant? or not occupant?.isSlippery()
                             @move_action = @getActionWithId Action.FORWARD
                 else
                     occupant = world.getOccupantAtPos @position.plus @getDir() 
-                    if occupant == null or not occupant.isSlippery()
+                    if not occupant? or not occupant?.isSlippery()
                         @move_action = @getActionWithId Action.CLIMB_UP
             
             if @move_action == null
diff --git a/coffee/levels/escape.coffee b/coffee/levels/escape.coffee
index a64a58f..e2bfdfd 100644
--- a/coffee/levels/escape.coffee
+++ b/coffee/levels/escape.coffee
@@ -28,9 +28,9 @@ module.exports =
     create: ->
 # 
         s = world.size
-        
-        exit_switch = KikiSwitch()
-        exit_switch.getEventWithName("switched").addAction(continuous(() -> world.toggle("exit")))
+        Switch = require '../switch'
+        exit_switch = new Switch()
+        exit_switch.getEventWithName("switched").addAction world.continuous () -> world.toggle "exit"
         world.addObjectAtPos(exit_switch, world.decenter( 0, -2, 0))
         
         world.addObjectAtPos('KikiStone', world.decenter( 0, s.y/2, 0))
diff --git a/coffee/levels/jump.coffee b/coffee/levels/jump.coffee
index 9497d3b..23c1e92 100644
--- a/coffee/levels/jump.coffee
+++ b/coffee/levels/jump.coffee
@@ -9,10 +9,10 @@ module.exports =
                 
                 jump on the stones to reach it
                 
-                you can attach to a stone when falling by
+                you can attach to a stone when falling
                 if you move into its direction
                 """
-    player:   position:         [0,0,5]
+    player:   position: [0,0,5]
     exits:    [
         name:         "exit"
         active:       1
@@ -22,11 +22,11 @@ module.exports =
 
         s = world.size
         
-        world.addObjectAtPos('KikiWall', world.decenter(0,0,1 - s.z/2))
-        world.addObjectAtPos('KikiWall', world.decenter(0,0,3 - s.z/2))
-        world.addObjectAtPos('KikiWall', world.decenter(0,0,6 - s.z/2))
-        world.addObjectAtPos('KikiWall', world.decenter(0,1,10 - s.z/2))
-        world.addObjectAtPos('KikiWall', world.decenter(1,0,10 - s.z/2))
-        world.addObjectAtPos('KikiWall', world.decenter(-1,0,10 - s.z/2))
-        world.addObjectAtPos('KikiWall', world.decenter(0,-1,10 - s.z/2))
+        world.addObjectAtPos 'KikiWall', world.decenter 0,0,1 - s.z/2
+        world.addObjectAtPos 'KikiWall', world.decenter 0,0,3 - s.z/2
+        world.addObjectAtPos 'KikiWall', world.decenter 0,0,6 - s.z/2
+        world.addObjectAtPos 'KikiWall', world.decenter 0,1,10 - s.z/2
+        world.addObjectAtPos 'KikiWall', world.decenter 1,0,10 - s.z/2
+        world.addObjectAtPos 'KikiWall', world.decenter -1,0,10 - s.z/2
+        world.addObjectAtPos 'KikiWall', world.decenter 0,-1,10 - s.z/2
         
\ No newline at end of file
diff --git a/coffee/lib/pos.coffee b/coffee/lib/pos.coffee
index bc915b2..414035e 100644
--- a/coffee/lib/pos.coffee
+++ b/coffee/lib/pos.coffee
@@ -32,7 +32,7 @@ class Pos
     minus: (p) -> new Pos @x-p.x, @y-p.y, @z-p.z
     plus:  (p) -> new Pos @x+p.x, @y+p.y, @z+p.z
     mul:   (f) -> new Pos @x*f, @y*f, @z*f
-    div:   (d) -> new Pos @x/d, @y/d, @z/d
+    div:   (d) -> new Pos Math.floor(@x/d), Math.floor(@y/d), Math.floor(@z/d)
     eql:   (p) -> @x==p.x and @y==p.y and @z==p.z
     
     add: (p) -> 
diff --git a/coffee/lib/vector.coffee b/coffee/lib/vector.coffee
index aa73cb2..101958f 100644
--- a/coffee/lib/vector.coffee
+++ b/coffee/lib/vector.coffee
@@ -24,7 +24,6 @@ class Vector
             @w = w
         if Number.isNaN @x
             throw new Error
-        # log "Vector #{x} #{y} #{z} #{w} -> #{@x} #{@y} #{@z} #{@w}"
 
     copy: (v) -> 
         @x = v.x
@@ -114,9 +113,7 @@ class Vector
         point.minus(planeNormal).dot point.minus(planePos).dot(planeNormal)
 
     @rayPlaneIntersectionFactor: (rayPos, rayDir, planePos, planeNormal) ->
-        # ((planePos - rayPos) * planeNormal) / (rayDirection * planeNormal);
         r = planePos.minus(rayPos).dot(planeNormal) / rayDir.dot(planeNormal)
-        # log 'rayPlaneIntersectionFactor', r
         if Number.isNaN r
             log 'rayPos', rayPos
             log 'rayDir', rayDir
diff --git a/coffee/world.coffee b/coffee/world.coffee
index 5cba9b2..4b71405 100644
--- a/coffee/world.coffee
+++ b/coffee/world.coffee
@@ -150,11 +150,12 @@ class World extends Actor
         @levelList = [
             # intro
             "steps", 
-            "start", 
+            # "start", 
             #"move", "electro", "elevate", 
             # "throw", 
             # easy
-            "gold", "jump", "escape", "gears", 
+            # "gold", 
+            "jump", "escape", "gears", 
             # "gamma", 
             "cube", "switch", "borg", 
             "mini",