diff --git a/client/scripts/10-config.coffee b/client/scripts/10-config.coffee
index ac296d5..3046e37 100644
--- a/client/scripts/10-config.coffee
+++ b/client/scripts/10-config.coffee
@@ -11,3 +11,9 @@ CONF =
   anim:
     time: 300
     func: 'smootherStep'
+
+  layer:
+    background: 0
+    playmats: 1
+    cards: 2
+    focus: 3
diff --git a/client/scripts/20-component-card.coffee b/client/scripts/20-component-card.coffee
index 9795dbd..99db182 100644
--- a/client/scripts/20-component-card.coffee
+++ b/client/scripts/20-component-card.coffee
@@ -1,19 +1,26 @@
+################
+# component name
 Crafty.c 'Card',
+  # Mouse interactivity, Tween (animation smooth)
   required: '2D, Canvas, Mouse, Tween'
 
+  # initialize card
   init: ->
     @attr {
-      w: 1 * CONF.card.w
-      h: 1 * CONF.card.h
+      z: CONF.layer.cards
+      w: CONF.card.w
+      h: CONF.card.h
       tapped: false
     }
     @origin 'center'
     return
 
+  # on destroy (TODO/example)
   remove: ->
     Crafty.log 'Card was removed!'
     return
 
+  # smooth placement
   place: (px, py) ->
     @tween {
       x: px
@@ -21,12 +28,14 @@ Crafty.c 'Card',
     }, CONF.anim.time, CONF.anim.func
 
   events:
+    # Tap or untap, pass true iff you want to tap
     Tap: (newState) ->
+      # store new state in property as boolean value
       @tapped = !!newState
-      _rotation = @baseRot + 90 * @tapped
 
+      # animate to new rotation, @tapped has "int" value 0 or 1
       @tween {
-        rotation: _rotation
+        rotation: @baseRot + 90 * @tapped
       }, CONF.anim.time, CONF.anim.func
       return
 
@@ -34,39 +43,46 @@ Crafty.c 'Card',
       @trigger 'Tap', !@tapped
       return
 
+    # bring card to focus layer and back
     MouseOver: ->
-      @z_old = @_z
-      @z = 1
+      @z = CONF.layer.focus
       return
 
     MouseOut: ->
-      @z = @z_old
-      delete @z_old
+      @z = CONF.layer.cards
       return
 
-
+################
+# component name
 Crafty.c 'EnemyCard',
+  # is a card
   required: 'Card'
 
+  # turned by default
   init: ->
     @baseRot = 180
     @rotation = @baseRot
     return
 
-
+################
+# component name
 Crafty.c 'AllyCard',
+  # is a card
   required: 'Card, Draggable'
 
+  # straight by default
   init: ->
     @baseRot = 0
     @rotation = @baseRot
     return
 
   events:
+    # un-/tappable
     DoubleClick: ->
       @trigger 'ToggleTap'
       return
 
+    # snap to 100×100 grid (TODO)
     StopDrag: ->
 
       round100 = (v) ->
diff --git a/client/scripts/30-scene-game.coffee b/client/scripts/30-scene-game.coffee
index 9bf7888..30a70f9 100644
--- a/client/scripts/30-scene-game.coffee
+++ b/client/scripts/30-scene-game.coffee
@@ -1,22 +1,25 @@
+# free viewport
 Crafty.viewport.clampToEntities = false
 
-Crafty.viewport.follow(Crafty.e('2D, Canvas')
-  .attr {
-    x: 0
-    y: 0
-    w: 1 * CONF.playmat.w
-    h: 2 * CONF.playmat.h
-  }
-  .origin('center')
+# attach viewport to an entity twice as big as a playmat
+Crafty.viewport.follow(
+  Crafty.e('2D, Canvas')
+    .attr {
+      w: 1 * CONF.playmat.w
+      h: 2 * CONF.playmat.h
+    }
+    .origin('center')
 )
 
+# scale viewport automatically (show that new entity)
 Crafty.bind 'ViewportResize', ->
-  sX = @viewport._width / 1600
-  sY = @viewport._height / 1800
+  sX = @viewport._width / (1 * CONF.playmat.w)
+  sY = @viewport._height / (2 * CONF.playmat.h)
 
   @viewport.scale Math.min(sX, sY)
   return
 
+# force scale adjustment
 Crafty.trigger 'ViewportResize'
 
 # Testing playmat