Comment by quuxplusone

Is it even possible to "complete a vertical line"? In normal Tetris, completing a vertical line means you've lost, because the screen has filled up.

Various suggestions: Make completing a line rotate the board instead of flipping it. Make completing a 4x4 quadrant rotate the board in the appropriate direction. Make rotating the board not re-fall the blocks (since as others have said, this makes the game trivial): this would make it almost instant death to rotate the board twice in the same direction in a row, which might not be a bad idea.