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Apparatus
www.apparatusgame.com/, posted 2011 by peter in android game handheld mobile physics simulation
Apparatus is a sandbox puzzle game for Android devices. Use your hammer to pin planks and wheels together to build anything you can imagine, connect your apparatus to motors and give them power using batteries.
Admittedly, I haven't tried it, but it looks like a lot of fun and I really like sandbox games. I almost wish I had an Android device now.