TetriCycle is Tetris projected onto a cylindrical surface. Rotate the cylinder left/right such that the descending piece falls into place. TetriCycle is freeware, can be distributed freely and should never be charged for.

Changes:

Shadow option — see where the current piece will drop.
Preview option — see what the next piece will be.
Multiplayer looks better. Each playfield is drawn from the same perspective, but with a shifted viewport.

http://wiibrew.org/wiki/TetriCycle