Got a couple of iPhones and an iPad gathering dustr around the house? If so, you can use them to play what might be the most expensive game to ever hit the App Store. It's not the initial $4.99 download that'll bust your bank account, but the $900 in hardware you'll need to play the game. 'PadRacer' is a top-down perspective racing game for the iPad that requires you use an iPhone (or iPod touch) to control your car. That's right, you can only play this game if you own both device……

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