Tetris is based on a boring old rectangular grid; Trisection uses a gridof equilateral triangles that will make you think "outside the box".Tetris is based on completion of horizontal lines, which is sointellectually trivial that it is mostly a reflex "twitch" game;Trisection is based on completion of colored areas, and it's much moreintellectually challenging. Tetris is the same on every level, it justgets faster and faster; Trisection adds complexity through new colorsand new triangle types to keep things interesting, not just physicallychallenging. Tetris will make your hands hurt; Trisection will make yourbrain hurt.