The Best Tetris

TRIS
- Tetris for the iPod touch and iPhone -

created by Noah "mahalis" Witherspoon (blog)
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The controls are incredibly intuitive. Drag the piece in any direction around with your finger and tap to rotate. This game looks amazing. Everything about the interface makes this game look incredible from the menu screen to gameplay itself, and pieces drop smoothly.
You can find the game in Installer if you have Community Sources or you can manually install it by downloading it here.