Blockis by MOB - Blockis is a standard tetris-type game. Only one level, no sound.
Left & right moves the block sideways, down moves downwards faster, game A & game B rotates the block. Fire & up works as game B. Note that game A, game B, & fire can be on different positions than you are used to because GameCanvas is used in polling mode. In order to move the block sideways one step, you must press the key briefly.
If the game doesn't work on your device you might try updating the software of your device.