Blocks fall into the well, and there are no arrow keys. Under the board sit four action words: ← left, ↻ rotate, ▼ drop, → right. Type a word and the block moves, then a new word takes its place. Each word starts with a different letter, so the first letter you type picks the action — Backspace lets it go. A wrong key pushes the block down one row. Fill a whole row to clear it. Marathon speeds up every 10 lines and ends when the stack reaches the top; Blitz lasts three minutes.