Seattle-based Felt LLC and Patrick Morgan of Galvanic Games have released a pretty neat little ad-supported freebie to check out in Polyeon (Free), which is available now. This is a game where you’re presented with four shapes on screen, and you must perform the action that corresponds with the shape to clear it. Squares must be tapped four times, triangles swiped three times, circles must be tapped and held to remove, and there are switches which must be held to unlock another shape. This is a game that requires that you use multitouch to do well.

The game is governed by a timer which is constantly ticking down, and each shape cleared adds more time. You will eventually lose by not clearing enough shapes fast enough, as you use more time than what you earn back, so high scores are about reacting quickly and consistently. Polyeon is pretty fun, and it’s free to download, with only the occasional ad that pops up.