Ambrosia has released SketchFighter 4000 Alpha, a $19 action game that looks for all the world like playing in a sketchbook.
The game combines the look and feel of pen and paper sketches with a resolution independent OpenGL graphics engine. It combines elements of exploration and action game play, one minute you are fighting, the next you are trying to puzzle your way through the hand-drawn challenges presented to you.
The game supports up to two players, over the internet or on the same machine. It also offers a level editor, and lets users share levels they create.