Stack falling tiles, clear lines, don't top out.

• Desktop: ← / → to move, ↑ to rotate, ↓ to soft-drop, Space to hard-drop.
• Mobile: swipe left/right to move, tap to rotate, swipe down to drop.
• C holds the current piece for later. P pauses.
• Clear 1/2/3/4 lines for 100/300/500/800 × level.
• Speed increases every 10 cleared lines.

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