Trisection is a fast-action puzzle game for Mac OS X that was inspired by Tetris.
Tetris is based on a boring old rectangular grid; Trisection uses a grid of equilateral triangles that will make you think "outside the box". Tetris is based on completion of horizontal lines, which is so intellectually trivial that it is mostly a reflex "twitch" game; Trisection is based on completion of colored areas, and it's much more intellectually challenging. Tetris is the same on every level, it just gets faster and faster; Trisection adds complexity through new colors and new triangle types to keep things interesting, not just physically challenging. Tetris will make your hands hurt; Trisection will make your brain hurt.