Grid Wars is a complete rip-off of Xbox 360's game Geometry Wars and is available for download at under 5 MB. Geometry Wars is one of the most popular games on the Xbox 360 at the moment, which is an impressive statement when you consider that it's an independently developed game available only for download.
Grid Wars is a fast, chaotic, pretty arcade shooter and it definitely won't help you with your homework. I don't normally post downloadable games on I'm a Human Inbox, but this one comes highly recommended and I encourage you to give it a try.
Link (via Kotaku)