Constructor
new GamePlay()
    Constructor for the Game Play Mode
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Methods
createTerrain()
    Create the terrain
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draw()
    draw background and exit immediately
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startup()
    Startup actions that require access to the game engine
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update(dt)
    Update the projectile debug mode - adds new projectile if there are none
currently in the screen
    Parameters:
| Name | Type | Description | 
|---|---|---|
| dt | number | The time between the current frame and the previous frame. | 
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