A rare giant pearl. You must retrieve the pearl, or you will be stuck on the bottom of the sea forever. You are Captain Nemo and that no-good squid just stole the nautilus power source.

GameCanvas is a Canvas with additional capabilities; it provides methods for immediate painting and for examining the state of the device keys. These new methods make it possible to enclose all of a game's functionality in a single loop, under control of a single thread. To see why this is attractive, think about how you would implement a typical game using Canvas:
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