One Infinite Tunnel for iDevices (by Artman)
"One Infinite Tunnel" A "universal" game app that I bought a few days ago for a buck has apparently gone free. It runs great on iPad and iPod Touch 4. Not the most replay value (though I personally have racked up over 70 plays, according to the stats), but quite worth checking out. According to the developer, the latest update improves performance on 3GS devices.