Size Five Games announces that Gun Monkeys is holding a free weekend on Steam, where anyone with a Steam account can check out the indie multiplayer platformer/shooter for Windows and OS X between now and Sunday afternoon. For those who enjoy the game, it is also on sale for half-off during that period as well, and as always, purchasers will receive a second copy to gift to a friend. Here's a refresher on what to expect: "Gun Monkeys provides short, sharp jabs of intense multiplayer combat. It’s a procedurally-generated, physics-based, 1-on-1, online platform shooter and it’s going down a complete storm with players."