Firefly was developed as a simple, fun game which was used to test Surface's multi-touch feature. Using all your fingers, you corral the fireflies into your glass jar, but, at the same time, you can also squash a neighbor's fireflies. You just have to be careful not to squash your own! To see Firefly in action, you can watch a video of it here. The game was never intended to be anything more than a test program for Surface, but it looks pretty fun. Maybe this will be included when Surface becomes available to the consumer?