Tap Tap Revenge works on the same level as the Guitar Hero games, with highlighted bars moving across three tracks along a grid. However, instead of strumming notes, you tap the bars with your fingers. Time these hits just right and you'll score a combo. Once you chain 50 hits or more together, you can shake the iPhone to activate Revenge mode, which significantly bumps up your score. Miss one bar, however, and you're right back to square one.
There's one frustrating element to the gameplay. In some parts of each song, you'll need to shake your iPhone in a certain direction: left, up or down. For the most part, this works fine, but in higher difficulty settings, it's sometimes difficult to get the device to correctly read your motions. As a result, you'll miss getting a perfect combo.