Tetris is a tile-matching puzzle video game where players complete lines by moving differently shaped pieces (tetrominoes), which descend onto the playing field.
- The game starts with an empty board.
- Pieces fall from the top; rotate and move them to form complete horizontal lines.
- Completed lines disappear, and points are scored.
- The game speeds up as levels increase (every 10 lines).
- The game ends when pieces stack to the top.
- Scoring: 40 for single, 100 for double, 300 for triple, 1200 for tetris (x level).