This is a free version of online multiplayer puzzle - Pentis Pro HD.
There are 3 modes. You can play a single-player game or a 3-games match with a computer (either against or together).
To manipulate a falling piece, use buttons or the following gestures (you can touch anywhere inside the field):
Move left/right - horizontal panning
Rotate - turning flick
Drop - flick down (directly under the piece)
Mirror-Reflect - double tap
Enjoy.