How to play Tetris: stacking, rotation and T-spins

Tetris has one rule and an enormous amount of depth hidden inside it. This guide covers the rules as written, then the three habits that separate a thirty-second game from a five-minute one: flat stacking, the open column, and not chasing the four-line clear until you can afford it.

The rules in one paragraph

Seven shapes fall into a well ten blocks wide and twenty tall. Move and rotate each shape as it falls. When every cell in a horizontal row is filled, the row clears, everything above it drops one row, and you score. If a new shape cannot enter at the top, the game ends.

That is the whole game. There is no opponent, no timer and no randomness you can dodge — only the shape order and how well you place what you are given.

The seven shapes

The seven tetrominoes are the four-cell combinations that are not a straight line of four, a square, or a shape with a hole: I, O, T, S, Z, J, L. Each has four rotations except O (which has one) and I/S/Z (which effectively have two).

Two of them are your friends and two are your enemies. I clears four rows at once and is the reason you leave a column open. T is the only piece that can fill a one-deep notch from the side, which is why advanced play revolves around it. S and Z are the ones that ruin a flat surface: they have no flat bottom edge in either orientation, so they always leave a bump.

Habit 1 — stack flat, not tall

Beginners panic and drop pieces wherever they fit. The result is a jagged skyline with three holes underneath it that can never be filled.

Good stacking means keeping the surface within one or two blocks of height across all ten columns. When you place a piece, ask what it does to the silhouette, not just whether it fits. A piece that fills a gap but leaves a two-block spike is usually worse than one that fits nowhere obvious but keeps the row even.

Holes are the real enemy. A hole — an empty cell with a block directly above it — can only be filled by a vertical I, and you do not get to choose when that arrives. One hole costs you roughly a piece; four holes cost you the game.

Habit 2 — leave one column open

The standard beginner-to-intermediate strategy is to build your stack flat everywhere except one column, usually the far right or far left, kept completely empty from the floor up. That column exists for one reason: the I-piece.

When an I arrives, rotating it vertically and dropping it into that column clears four rows at once. Four rows is worth eight times a single line, and it also removes the accumulated height in one move — which is the actual benefit. Height is what kills you.

The risk is obvious: a well that is four rows deep is a well that can swallow a bad piece. If the surface is uneven or you have no clear way to keep it flat, abandon the column and clear singles. A safe five-minute game beats a heroic ninety seconds.

Habit 3 — learn the rotation, not the piece

Every rotation is a shape you have to be able to see before the piece lands. The useful drill is to name the shape you need while the previous piece is still falling, then place the next one without hesitating in the last two rows.

Wall kicks matter more than people expect. A piece that cannot rotate in place is usually one column away from being able to — against a wall or against the stack. Good players rotate into tight spaces on purpose; beginners only rotate in open air.

Where these rules come from

The behaviour described here follows the modern Tetris Guideline — the specification competitive games are built against — rather than the 1984 original. That matters for two details: rotation uses wall kicks (a piece can rotate next to a wall by shifting sideways), and the piece order uses a seven-bag randomiser, so you are guaranteed to see every shape once before any repeats.

If you want the deep end, the T-spin reference documents every recognised spin type. You do not need it to enjoy the game.

Scoring, roughly

Single 100, double 300, triple 500, four lines 800 — multiplied by the level. Soft drops score one point per row, hard drops two per row. This is why a four-line clear at level ten is worth more than an entire early game.

What a T-spin is

A T-spin is a clear made by rotating a T-piece into a slot it could not have slid into. The classic setup is a one-block-deep notch with an overhang: the T rotates down into it and completes a row.

It scores more than a normal clear and it is the first technique that makes the game feel like a system rather than a reflex test. Do not learn it first — flat stacking comes before T-spins, because a T-spin on top of a broken stack is worthless.

A five-step practice plan

1. Play at level one until you can clear ten lines without a hole. Speed is irrelevant; the surface is everything.
2. Then add the open column. Keep the rightmost column empty for the whole game. Watch how often the I arrives late and you are stuck.
3. Then allow yourself one four-line clear per game. Not more. You are learning when it is safe, not how to do it.
4. Learn the S and Z placements. Those two ruin more stacks than any other piece. Practise laying them flat against a wall.
5. Only then chase speed. Fast play on a bad stack is just losing faster.

Frequently asked questions

Do I ever need to guess where a piece goes?

No, but you do need to plan two pieces ahead. The piece you cannot place well is usually the consequence of the piece you placed badly one move earlier.

Is it better to clear lines fast or stack high?

Clear lines to stay alive, stack intentionally only when you can clear four. Height without a plan is just a slower loss.

Why does my stack always develop holes?

Almost always because you placed a piece into a gap that had no flat bottom, usually an S or Z laid over an uneven row. If a gap needs a specific piece to fill it, it is not a gap, it is a hole waiting to happen.