Seven tetromino shapes fall one at a time into a well ten columns wide and twenty rows deep. Move and rotate each piece as it descends so it fills gaps in the stack, and any row completed across all ten columns is removed with everything above it dropping down. The game ends when a new piece has nowhere to spawn.
Points depend on how many rows one piece clears: 100 for one, 300 for two, 500 for three and 800 for four, then multiplied by your level. The level is 1 plus your line count divided by ten, so it rises every ten lines and makes every later clear worth more. It also sets the pace, with the fall interval running at 500ms minus 40ms per level, down to a floor of 100ms.
No. Arrow Up is the only rotation and it always turns clockwise, so three presses give you the counter-clockwise position.
Yes. Every ten lines adds a level, and each level cuts 40ms from the time between drops until it reaches 100ms.
Yes — on a touch screen the game shows on-screen buttons, and games played with a mouse work by tapping.