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Falling-block puzzle. Place tetrominoes to complete lines and prevent the stack from reaching the top. Speed increases as you level up.
Rotate and move pieces to form full horizontal lines. Clear multiple lines at once for higher scores (Tetris = 4 lines).
Desktop: Arrow keys move/rotate (Up = rotate), Space = hard drop (varies by build). Mobile: On-screen buttons/gestures if available.
Keep a well for I‑pieces; avoid creating overhangs you can't fill; think in shapes and future placements, not only the current piece.