- Programming language: JavaScript
- Main size: 1,3 KB
- Extra size: 234 B
- Total size: 1,5 KB
- Feature count: 18
- Bytes per feature: 71 B
- I, M or ↓: soft drop
- J or ←: move left
- K or ↑: rotate counterclockwise
- L or →: move right
- Ctrl+R or ⌘ Cmd+R: restart
- Ctrl+W or ⌘ Cmd+W: quit
- Space: hard drop
- All tetrominoes
- Alternative drop: piece falls at maximum speed
- Colored pieces
- Drop
- Game over detection
- Game over screen: frowning face
- Gravity
- Horizontal movement
- Line clearing
- Line clear points:
- Single: 9
- Double: 27
- Triple: 63
- Tetris: 135
- No bugs
- Piece preview: single piece
- Placement points: 9
- Quit: close tab
- Restart: refresh page
- Retry: refresh page
- Rotation
- Sleep mode: from O