Tetris – Clear Lines on a 10×20 Board
Rotate, move and hard-drop tetrominoes, build complete rows and handle faster automatic drops every ten cleared lines.
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Tetris
About Tetris
This browser Tetris implementation uses a 10×20 board and seven tetromino shape families. Full rows disappear and award a level-scaled score based on whether one, two, three or four lines are cleared at once.
Difficulty comes from drop speed. Level rises every ten cleared lines, and the automatic drop interval shrinks from its starting pace toward a 100ms minimum.
How to Play Tetris
1Move pieces left or right and rotate them before they lock.
2Use soft drop for controlled descent or hard drop to place a piece immediately.
3Complete horizontal rows with no gaps to clear them and score.
4Keep the stack low enough that each new tetromino can spawn.
Tetris Rules
- The board is 10×20.
- One, two, three and four-line clears score 100, 300, 500 and 800 multiplied by current level.
- Level increases every 10 total cleared lines.
- A blocked spawn ends the run.
Tetris Line-Clear Scoring
| Action | Base × Level | How it works |
|---|---|---|
| 1 line | 100 × level | — |
| 2 lines | 300 × level | — |
| 3 lines | 500 × level | — |
| 4 lines | 800 × level | — |
Tetris Game Mechanics
Objective
Rotate and place seven tetromino shapes on a 10×20 board, clear complete rows and keep the stack from blocking new pieces.
Round End
Game Over occurs when a newly spawned tetromino already collides at its starting position.
- The board is 10 columns by 20 rows and uses the seven standard tetromino shape families.
- Level is floor(total lines / 10) + 1, so every 10 cleared lines raises the level.
- Automatic drop interval is max(100ms, 500ms − 40ms × level), making pieces fall faster as level rises.
- The mobile runtime provides visible buttons for left, rotate, soft drop, right and hard drop; desktop also supports keyboard controls and pause.
- Score, lines and level exist only in the active run and are not saved to localStorage.
Tips & Strategies
- Keep the surface relatively flat so several different tetrominoes remain placeable.
- Save a vertical gap only when you have a realistic plan for an I-piece; an open trench can become dangerous as drop speed rises.
- At higher levels, use hard drop only after confirming rotation and horizontal position because the automatic timer leaves less recovery time.
Game Info
| Game Name | Tetris |
| Category | Puzzle |
| Difficulty | Medium |
| Platform | Web Browser |
| Price | Free |
| Players | 1 Player |
| Controls | Keyboard / Touch |
| Last Updated | 2026-08-07 |
Frequently Asked Questions
What size is the Tetris board?
The board is 10 columns wide and 20 rows tall.
How does Tetris scoring work here?
Clearing 1, 2, 3 or 4 lines awards 100, 300, 500 or 800 multiplied by the current level.
How often does the level increase?
Level is floor(lines / 10) + 1, so every 10 cleared lines raises it by one.
Can I play this Tetris on mobile?
The runtime includes visible touch buttons for left, rotate, soft drop, right and hard drop. Human device QA is still tracked separately from code support.
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