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One of the cool things about the Wii version of Tetris is that you can control the fallings blocks with your remote. Considering that kde games can capture the mouse (as seen in kbreakout), I think allowing mouse control in kblocks would be cool as well. Moving the mouse left will cause the block to move left, moving the mouse to the right will cause the block to move right, moving the mouse down or clicking the middle mouse button will cause the block to drop, and clicking the left or right mouse buttons will cause the block to rotate counterclockwise or clockwise, respectively.