Tetris

Tetris is the falling-block puzzle that defined a genre and probably the most-played video game in human history. Created in 1984 by Soviet computer scientist Alexey Pajitnov at the Computing Center of the USSR Academy of Sciences in Moscow, it has been sold or distributed on virtually every game platform ever made — over 520 million copies of paid versions, plus billions of free plays. Seven tetromino shapes (I, O, T, S, Z, L, J) fall from the top of a 10-wide playfield; rotate and shift them to complete horizontal lines, which then clear; survive as long as you can while the speed climbs.

How to play

• Left / Right arrows — shift the falling tetromino horizontally.
• Up arrow — rotate clockwise.
• Down arrow — soft drop (move down faster while held).
• Space — hard drop (slam the piece to the bottom instantly).
• Fill a complete horizontal row to clear it. Multiple rows clear simultaneously for bonus points.
• Game ends when the stack reaches the top of the playfield.

Scoring (modern guideline)

• Single (1 line) — 100 × level
• Double (2 lines) — 300 × level
• Triple (3 lines) — 500 × level
• Tetris (4 lines, using the I-piece) — 800 × level
• T-Spin Double — 1,200 × level (high-skill move)
• T-Spin Triple — 1,600 × level (top-tier scoring)
• Back-to-back bonus — +50% if your last two scoring clears were both Tetrises or T-Spins.

Beginner strategy

• Keep the stack flat. Tall single columns are tetromino traps — they limit where future pieces can land. A flat, even surface gives you placement flexibility.
• Build for line clears, not for safety. Filling rows clears them. Stacking pieces neatly without clearing just brings the ceiling down faster.
• Don’t fear the right column. Beginners over-protect column 10 (saving for the I-piece Tetris). Holes you leave waiting for that I-piece often kill you first. Take available doubles and triples.
• Hard drop sparingly at high levels. Hard drop locks instantly. Slow falling pieces let you slide them into corners; hard drop forfeits that flexibility.
• Watch the Next queue. Modern Tetris shows the next 3-7 pieces. Plan two pieces ahead, not just the current one.

Intermediate strategy

• Reserve column 10 for I-pieces, but only if your stack is otherwise clean. A 4-row well on the right side is the classic Tetris setup — when the I-piece arrives, slot it in for 800 × level.
• Master the T-spin. When a T-piece can rotate into a slot that’s only reachable by rotation (the standard “T-slot”: three blocks below and one above), it counts as a T-Spin and triples the score for any lines cleared.
• Hold piece tactically. Modern Tetris lets you “Hold” the current piece for later. Use Hold for the I-piece — drop it when a Tetris is set up, hold it again if your well isn’t ready.
• Recognize danger heights. Once the stack reaches the top 4 rows, you’re in survival mode. Stop optimizing for points; start clearing every line you can to bring the stack back down.
• Multi-line clears compound. A Tetris (800) is worth more than four Singles (400). A T-Spin Triple (1,600) is worth more than a Tetris. Set up scoring opportunities, don’t just clear linearly.

Advanced strategy

• SRS (Super Rotation System) wall kicks. Modern Tetris allows rotation against walls and ceilings via “wall kicks” — the game tries multiple offset positions if the basic rotation collides. Memorize the kick tables; they enable spins that look impossible.
• Soft-drop control. The 20G era (every frame the piece drops a row) requires you to position pieces purely with input timing. Practicing this builds the muscle memory needed for serious competition.
• Stack from the bottom. Never leave gaps under blocks — they become unreachable wells. If you must leave a hole, plan a T-spin or S-spin to access it.
• Open vs full T-Spin Doubles. A T-Spin Double can clear two lines beneath an existing stack — devastating for an opponent in Tetris Battle modes, where lines you clear above 1 send “garbage” to your opponent.
• Perfect Clear (All Clear). Clearing the entire playfield to zero blocks gives a massive bonus (3,800 × level for a Tetris Perfect Clear). High-level players set up Perfect Clears at the start of every game.

History and notable moments

• 1984 — Soviet Union: Pajitnov writes Tetris in Pascal on an Elektronika 60 computer. It spreads through Soviet institutions before reaching the West.
• 1989 — Game Boy: Tetris ships bundled with the original Game Boy. Nintendo sells 35 million units of the Game Boy version alone — the moment Tetris becomes a worldwide phenomenon.
• 1990s — multiple lawsuits: ownership of Tetris was disputed for years between Pajitnov, the Soviet government, Atari, and Nintendo. Pajitnov regained rights in 1996; The Tetris Company now licenses all official Tetris.
• 2010 — Tetris Effect coined: the psychological phenomenon where the game’s imagery persists in dreams and after-images after extended play, named by researchers and now a recognized cognitive effect.
• 2024 — first human “beats” Tetris: 13-year-old Willis Gibson reached the “kill screen” on NES Tetris (level 157), the first human to do so. Previously thought impossible without AI assistance.

Common mistakes

• Building too high before clearing. Beginners stack tetrominoes neatly without ever clearing — then panic when the top approaches.
• Creating unreachable holes. Dropping an L or J without considering rotation often leaves a single-block gap underneath. That row can never clear without S/Z spins.
• Ignoring the Next queue. Treating each piece as an independent decision instead of planning combinations.
• Trying for a Tetris when one isn’t possible. If your right-most column is blocked, the I-piece can’t slot there. Take the available clears.

Tetris variants worth knowing

• Tetris 99 — 99-player battle royale (Nintendo Switch, 2019). Sends garbage to other players when you clear lines.
• Tetris Effect: Connected — musical/visual Tetris by Mizuguchi Tetsuya. Pieces sync to music. Praised for accessibility and meditative pacing.
• Puyo Puyo Tetris — crossover with the Puyo Puyo color-match game.
• NES Tetris — the 1989 NES version, still actively competed at the Classic Tetris World Championship. No hold piece, no SRS, brutal at level 19+.

FAQ

• Q: How many tetromino shapes are there? A: Seven — I, O, T, S, Z, L, J. The bag system in modern Tetris guarantees one of each every 7 pieces in random order.
• Q: What’s the maximum score? A: There’s no theoretical cap — well-played sessions exceed millions. Competitive NES Tetris caps the displayed score at 999,999 but the run continues internally.
• Q: Is the I-piece always vertical for a Tetris? A: The I-piece can be horizontal (4 wide, 1 tall) or vertical (1 wide, 4 tall). For a 4-line Tetris you place it vertically into a 4-deep well.
• Q: What’s a T-spin? A: Rotating a T-piece into a slot it couldn’t reach by horizontal movement. The game detects this and triples score for lines cleared on that placement.

For other puzzle games, try 2048, Block Puzzle, Minesweeper, or Sudoku.