Whilst it looks like a simple Tetris style game to beginners, It quickly transforms into a considerably more

challenging experience once the first Shuriken Drops! Controls

Use W and D or left and right arrow keys, to move falling blocks left or right.
use Q and E or C and V to rotate anti-clockwise and clockwise – (the up arrow also rotates clockwise)
hold down S, down arrow, or the space bar to speed up the fall speed