     @_mouseY = 0
     @_clickX = 0
     @_clickY = 0
+    @_mouseAlpha = 1.0
+    @_lastIX = 0
+    @_lastIY = 0
 
     @_board = []
 

    return unless @_state is STATE_GAME

    @_countDown -= dt

    if 0 >= @_countDown
      @setState STATE_END

  onMouseMove: (x, y) ->
    @_mouseX = x
    @_mouseY = y

    ix = @x2index @_mouseX
    iy = @y2index @_mouseY

    unless @_lastIX is ix and @_lastIY is iy
      @_mouseAlpha = 1.0

    @_lastIX = ix
    @_lastIY = iy

    return  # void

