About TETRA
TETRA is a free falling block puzzle game you can play instantly in your browser — no install or sign-up required. Move and rotate the 7 tetrominoes falling from the top to fill horizontal lines completely; each filled line clears and earns you points. All rules and controls follow the modern standard (guideline) for block puzzle games.
Key Features
- A standard 10×20 board with 7-bag randomization for fair distribution of all 7 pieces
- SRS rotation system with wall kicks — rotate naturally even against walls and the floor
- Hold (store a piece), ghost piece (landing preview), hard drop, and soft drop
- A 5-piece NEXT queue to plan your strategy ahead of time
- Line clear scoring with T-spin, back-to-back, combo, and perfect clear bonuses
- Three modes — Marathon, Sprint (40 lines), and Ultra (2 minutes) — with saved high scores
- Full support for both keyboard and mobile touch controls
- Light and dark themes, offline support, and 11 languages
How to Play
- Pieces automatically fall down the board. Move them left or right with the arrow keys (or on-screen buttons) and rotate with the rotate buttons to place them where you want.
- Fill an entire horizontal line with no gaps and it clears, dropping everything above it down. Clearing multiple lines at once scores more (up to 4 lines = a Tetris).
- Use hold to stash the current piece and swap it in later. The ghost piece shows where your current piece will land.
- Hard drop (Space or the on-screen button) instantly drops the piece to the bottom to speed things up.
- The game ends when pieces stack all the way to the top and there's no room for a new piece to spawn. Keep clearing lines steadily to stay low.
Frequently Asked Questions
Is TETRA free?
Yes, every feature is free with no sign-up or install required — all you need is a browser.
How do the keyboard controls work?
Use ← → to move, ↑ or X to rotate clockwise, Z to rotate counterclockwise, ↓ for soft drop, Space for hard drop, C or Shift to hold, and P or Esc to pause.
Does it work on mobile?
Yes, the touch controls at the bottom of the screen let you move, rotate, drop, and hold — everything you need.
What are SRS and wall kicks?
SRS (Super Rotation System) is the standard set of rules for how pieces rotate. A wall kick is an adjustment that nudges a piece slightly to complete a rotation when it's blocked by a wall or other pieces — it's the foundation of advanced techniques like the T-spin.
Where are my records saved?
High scores and records are stored only in your browser (localStorage), not on a server. They reset if you switch devices or browsers.
How do the modes differ?
Marathon is endless play where speed increases as you level up, Sprint is a time attack to clear 40 lines as fast as possible, and Ultra challenges you to score as many points as you can in 2 minutes.