Tetris is one of the best-selling video games of all time — over 500 million copies across every platform imaginable. It began as a puzzle program written by a Soviet software engineer on a Soviet-made computer in 1984, spread through unofficial copies across Eastern Europe, crossed into the West without its creator seeing a rouble of profit, and became a global phenomenon before intellectual property law could keep pace. You can play the original-style Tetris right now in your browser, free, with no download required.
The Soviet Origins of Tetris
Alexey Pajitnov was a computer scientist working at the Dorodnitsyn Computing Centre of the Soviet Academy of Sciences in Moscow in 1984. He was experimenting with a puzzle concept based on pentominoes — mathematical shapes made from connected squares — and built a prototype on an Elektronika 60, a Soviet terminal computer with no graphics capability. Pieces were represented by brackets. The game had no score. It barely ran.
Pajitnov simplified the shapes from five squares per piece to four (calling them tetrominoes, combining "tetra" with "dominoes"), and the result became Tetris. His colleagues at the Computing Centre played it obsessively, and it spread through floppy disk copies across Soviet research institutions within weeks. By 1986 a PC version had reached Hungary; by 1987 it was circulating in the West. Multiple Western companies simultaneously tried to acquire rights to a game whose intellectual property technically belonged to the Soviet government.
The legal battle for Tetris rights became one of the stranger stories in tech history, eventually resolved when Nintendo secured handheld rights for the Game Boy in 1989. That version sold over 35 million units and is credited by many analysts with making the Game Boy the dominant handheld platform of its era. Pajitnov himself didn't receive royalties until the mid-1990s, after the Soviet Union dissolved and he was able to negotiate directly with the Tetris Company he co-founded.
The Seven Tetrominoes Explained
Every Tetris piece is a tetromino — a shape made from four connected squares. There are exactly seven possible shapes: the I-piece (four in a straight line), the O-piece (a 2×2 square), the T-piece (a T-shape), the S-piece, the Z-piece (S and Z are mirror images), and the L and J pieces (L-shapes mirrored). Modern Tetris implementations use a "7-bag" system that guarantees each of the seven pieces appears once before any repeat — preventing the brutal droughts of a single piece that plagued early random versions.
How to Play Tetris
- Pieces fall from the top — A random tetromino appears at the top of the grid and falls downward automatically.
- Move and rotate — Use left/right arrow keys to shift the piece horizontally. Press up or Z to rotate it. Work quickly — pieces fall faster as levels increase.
- Place pieces to fill rows — Your goal is to fill complete horizontal rows with no gaps. A completed row clears and the rows above fall down.
- Clear multiple lines for bonus points — Clearing one line at a time is safe but inefficient. Clear two lines (Double), three (Triple), or all four (Tetris) for exponentially higher scores.
- Use hard drop — Press Spacebar to instantly drop the current piece to the lowest available position. Essential for maintaining speed at higher levels.
- Don't let the stack reach the top — If pieces stack to the ceiling, the game ends. Managing your stack height is more important than chasing every Tetris opportunity.
Clearing Lines Strategy
The core strategic tension in Tetris is between playing safe (clearing one line at a time, keeping the stack low) and playing for maximum score (saving space for I-pieces to clear four lines at once). Clearing four lines simultaneously — a Tetris — scores roughly twice as many points per line compared to clearing single lines. Competitive players build flat stacks with a single open column on the right side, feeding I-pieces into that column for continuous Tetris clears. This approach requires clean, flat play — every piece placed neatly, no awkward overhangs, no gaps buried under blocks.
Beginners should prioritise stack height over efficiency. A low, messy stack you can recover from beats a tall, neat stack that suddenly spills over. Once your piece placement is consistent, start thinking about structure. The difference between casual and skilled Tetris play is almost entirely stack management discipline.