{ "init":
  { "pixiImages":
    [ "imgEmpty",
      "imgButton0", "imgButton1", "imgButton2",
      "imgButton3", "imgButton4", "imgButton5"
    ],
    "ups": 6
  },

  "model":
  { "stage": 
    { "width":  1040,
      "height":  520
    },
    
    "board":
    { "columns":   40,
      "rows":      20,
      "obstacles": { "number": {"@min": 10, "@max": 20, "@integer": true },
                     "type":   ["@some", "button0", "button1", "button2",
                                         "button3", "button4"
                               ]
                   }
    },
    
    "worm":
    { "type":  "button5",
      "head":  { "i": {"@min": 5, "@max": 34, "@integer": true },
                 "j": {"@min": 5, "@max": 14, "@integer": true }
               },
      "start": ["@some", "left", "right", "up", "down"]
    },
    
    "item":
    { "type":   "",
      "width":  25,
      "height": 25
    }
  },

  "view":
  { "item":
    { "border": { "left": 0, "top": 0 },
      "gap":    1,
      "images": { "": "imgEmpty",
                  "button0": "imgButton0", "button1": "imgButton1",
                  "button2": "imgButton2", "button3": "imgButton3",
                  "button4": "imgButton4", "button5": "imgButton5"
                }
    }
  },
  
  "control":
  { "worm":
    { "left":  "ArrowLeft",
      "right": "ArrowRight",
      "up":    "ArrowUp",
      "down":  "ArrowDown"
    }
  }
}