N (2004)

N is an award-winning 2D action/puzzle platformer reminiscent of Lode Runner: you're a tiny stick figure running around in a puzzle-y world inhabited by enemies. But in N, there's a twist: the ninja is driven not only by a thirst for gold, but also by a physics simulation. Expect to encounter death frequently, animated with hilarious ragdoll physics. N includes a built-in editor, called Ned. You can make your own levels to share with the community or hoard for yourself. Infinite levels, woo!