Not sure when this went live, but Microsoft has made the free version of Tinker available for all Windows XP, Vista, and 7 users. (You may recall that this game was previously exclusive to Windows Ultimate Extras in Windows Vista.)

He's little, he's metal, and he's lost.

Being a small robot isn’t always easy. Being a small robot marooned in a surreal world of clockwork, inventive mechanisms and challenging puzzles, even less so. In Tinker, a free puzzle game that pushes the boundaries of robot deduction, you’ll guide your robot through switches, contraptions to reach the exit. He’ll only do what you command. He’ll only go where you tell him to. It’s up to you to get him home!

Featuring captivating visuals, an original music score, and 60 levels that range from the facile to the extremely challenging. Tinker is an isometric two-dimensional puzzle available for free. Tinker features a tutorial level to get you started. What are you waiting for? Get Tinker for free when you download Games for Windows - LIVE. Start Tinkering.

- Guide your small robot through 60 different levels of inventive mechanisms, switches, lasers, teleporters, and more!

- Earn Tinker Achievements only available through LIVE.

- Enjoy 3D graphics that enhance the majestic clockwork world!