Xbox 360 gamers have a nice surprise as two new free games from the Unlock Xbox contest have landed on Xbox Live Arcade. Not only are they free Achievement sources, but these games are comparable to many purchasable XBLA games in their own right.

One is Harms Way, a futuristic vehicle combat game with stellar graphics, and the other is Doritos Crash Course, a fun little title that uses and abuses your Live Avatar.