Sometimes the simple game design is the most fun. Look at Space Invaders. Watch Tetris. Watch Braid. They are all easy to play, with only a couple of controls to address, but there is a load of that challenge comes from the game within that basic framework.

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The same is true of Droplitz, an Xbox Live Arcade puzzle game of Atlus. And know that there are a lot of challenges in this game interesting and convincing.