iPhysics is a native 3rd party app that works on iPhone and iPod touch. It uses the motion sensors in the device. You play different levels of puzzles where you need to figure out how to use gravity to move the blue circle to meet the red square using objects that you draw.

To install the app you need to have Installer.app already then:
1. Start Installer.app
2. Click on “Sources”
3. Click on “Edit” button, then “Add” button
4. Type the following: “http://iphone.r4m0n.net/repos”
5. iPhysics should now appear in Installer.app

Here is a video demo of iPhysics in action:

The background music used in the video is Satisfaction by Benny Benassi.

Once you have iPhysics installed you can even download new themes called Levelpacks to make the game even more exciting.

Current available Levelpacks include: AstroPhysics, BadLeo, Baum, Baum 2, EpiLimiC, iPodTouchMaster05, JungZandvliet, JungZandvliet 2, Marvo, Mindfield’s Newton as a Child,
Moo - Crayon Golf, Rawd, Rawd - Aquarium, Rawd - iPod Touch Sandbox, Rawd - Mario, Rawd - Multi, Rawd 2, SKB, Stephen,
Stephen - The Basics. Here is a sample of how the AstroPhysics Levelpack looks like:

Use iPhone mods and hacks at your own risk! Installing 3rd Party iPhone apps requires you to jailbreak the iPhone before installing the native software and apps. You can use Installer.app for Mac OSX and iBrickr for Windows PC to do this. Browse the full list of all iPhone and iPod touch native 3rd party apps filed under the software category.

Get it here