And Yet It Moves

This game is unique among sidescrollers for another reason: And Yet It Moves makes gravity a key element by allowing you to rotate the world. (That explains the title based on Galileo's defiant, heretical claim that the earth revolves.) A false turn can send our young hero plummeting onto spiked rocks or put him in the trajectory of a falling boulder.

In the second level, solving puzzles requires an understanding of the laws of physics evoked by each turn of the earth. The game is clever in concept and ground-breaking in design.

--Ron White