         { kind: 'turtle', actions: {run: ['forward', 'right']}, editable: false }
       ]
     }
+    # TODO Explain Left-Right
+    # TODO Explain Limits
     {
       name: 'Click "Right" Program Brick to Remove It'
       comment: '

      ]
    }
    {
      name: 'Use "Interrupt" Program to Bounce Off Walls'
      comment: '
      Shows the power of reactive programming.
      Introduces concept of an interrupt handler.

      ]
    }
    {
      name: 'Use Only Four Bricks to Move Diagonally'
      comment: '
      Create a multi-stage program.
      Can get top score by using run loop to avoid final "Forward"s
