Free Puzzle Game Released On Games For Windows Live, Includes Achievements

Microsoft's Games For Windows Live has released a free puzzle game called Tinker, and gamers can log in with their Gamertags to earn achievements from their PC. It's part of the new Games on Demand service, and it features a clean interface with quick access to your friends list and achievements. The game itself is actually a fun little puzzler, requiring you to move a robot to his goal in as few moves as possible. Interested gamers (and unapologetic achievement whores) can check out the service here.