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  3. Tetris
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Tetris

Classic block-stacking puzzle game. Rotate and place falling tetrominoes to clear lines. Level up for faster drops.

Falling blocks, clearing lines, chasing scores, Tetris needs no introduction. Rotate and position tetrominoes as they drop, completing horizontal lines to clear them from the board. The pace accelerates as you progress, turning a relaxing puzzle into a frantic race against gravity.

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Tetris: a worked example

Rows are nearly full with a single vertical gap on the right and an I-piece is next.

Input

Rotate the I-piece vertical, drop it into the right-edge well
Tetris produces

Result

Four lines clear at once, a "Tetris", maximum line-clear bonus

Clearing four lines simultaneously with the I-piece scores far more than four single clears, so deliberately keeping a one-wide well and waiting for an I-piece is the high-score strategy. Gravity speeds up as you level, forcing faster placement decisions.

What is Tetris?

Falling blocks, clearing lines, chasing scores, Tetris needs no introduction. Rotate and position tetrominoes as they drop, completing horizontal lines to clear them from the board. The pace accelerates as you progress, turning a relaxing puzzle into a frantic race against gravity.

How to use

  1. 1Use arrow keys or touch controls to move and rotate falling pieces.
  2. 2Left/right arrows slide the piece. Up arrow (or a dedicated button) rotates it.
  3. 3Down arrow speeds up the drop. Hard drop instantly places the piece.
  4. 4Complete full horizontal lines to clear them and score points.
  5. 5The game ends when pieces stack to the top of the board.

Key features

  • All 7 standard tetromino shapes
  • Next-piece preview
  • Hold piece functionality
  • Ghost piece showing where the block will land
  • Increasing speed with each level
  • Line clear animations
  • Score and level tracking
  • Touch-friendly controls for mobile

Tips & best practices

  • Keep the board flat, avoid creating tall columns with deep gaps.
  • Leave one column open on the side for Tetris clears (4-line combos).
  • Use the hold piece to save an I-piece (long bar) for when you need it.
  • Learn the rotation system so you can tuck pieces into tight spaces.

Common use cases

  • Spatial reasoning practice

    Mentally rotating shapes and visualizing placements strengthens spatial thinking.

  • Stress relief

    The rhythmic flow of placing pieces can be meditative, until the speed kicks up.

  • Quick gaming session

    A round of Tetris fits perfectly into a 5-minute break.

  • Competitive play

    Chase high scores or compete with friends for the longest survival.

Stacking Strategy

Seven distinct tetromino shapes fall one at a time. Placing them efficiently means minimizing gaps and setting up multi-line clears. A "Tetris" (four lines at once) scores the most points and is deeply satisfying to pull off. The hold piece and next-piece preview give you tools to plan ahead, but speed eventually overwhelms all but the best players.

Frequently asked questions

What is the highest-scoring move?

A "Tetris"clearing 4 lines at once with the I-piece, scores the most points.

Does the speed cap at some point?

Speed increases with each level and eventually reaches a maximum, but it becomes extremely fast.

What is the ghost piece?

The transparent outline below your active piece shows exactly where it will land if you drop it now.

Private by design

The game runs entirely in your browser. No account is needed and no gameplay data is collected.