Tetris

Stack the falling tetrominoes and complete horizontal lines to clear them — four at once is a Tetris, and back-to-back Tetrises pay extra. The ghost outline shows where the piece will land; the Hold slot stashes a piece for later, once per drop. Every ten lines the level — and gravity — rises. The run ends when the stack reaches the top.

Keyboard: ←/→ move · ↓ soft drop · ↑/X rotate · Z rotate back · Space hard drop · C/Shift hold · P pause — or tap to rotate and swipe to move on touch screens