$20 Game of the Week: Universe Sandbox (PC)

Designed by Dan Dixon over the course of a 15 year period, Universe Sandbox is exactly what the title implies: a sandbox allowing you to play with the universe. Not so much a computer game as an education tool, Universe Sandbox is a gravity simulator. While it simulates our universe, you can pretty much adjust and test anything within the game, from the size of the planets, position of bodies, to collisions of stars and planets. There are several simulations included with the game, and you can edit them as you wish. So if you want a look at how our solar system looks, or bring about the apocalypse, then you’ll want to download this game. Makes for a good science project too.