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Original post by Edtharan Restrictions can be as simple as the controls that you decide to use. I heard of a workshop where the designers had to create a simple game in 1 day where the restriction was that the only control that they had was a single button, which could be pressed or not pressed. Now that is a restriction. :D

I think I can remember a game called Track & Field, where the entire gameplay consisted of hitting repeatedly, either as fast as possible; or in correct sequences, the one and only button the joystick had.