How to play Ninefold

Ninefold has three rules and one tension that grows out of them. The rules take ten seconds to learn; the tension is the game.

The rules

Three shapes are offered at a time in the tray. Drag one onto the grid anywhere it fits. Shapes never rotate and never fall — where you put it is where it stays.

When every square of a row, a column, or one of the nine three-by-three boxes is filled, that group clears. A single placement can complete several groups at once, and a square belonging to two completed groups clears once, not twice.

When all three shapes are gone, three more arrive. The run ends when nothing in the tray can be placed anywhere.

The tension

Filling the board and clearing the board are the same action. There is no way to pass, no way to discard, and no way to shrink a shape you did not want. Every placement is progress toward a clear and progress toward suffocation at the same time.

This is why the game is not really about the shape in your hand. It is about the shape of the space you leave behind. A placement that fits perfectly but leaves a one-square notch in the middle of the board has cost you far more than the two points it scored, because almost nothing in the bag is one square wide.

What the bag guarantees

Every hand of three is checked before it is offered: there is always some order in which all three can be placed on the board as it stands. This matters more than it sounds. A bag that does not check will, measurably, end roughly one run in sixteen the instant it deals — three shapes, nowhere for any of them, no move ever offered. That is indistinguishable from the game cheating.

So when a run ends here, it ends because the board had closed up before the hand arrived. The hand was playable when it was dealt; what you did with the first piece is what took the other two away.

When the board gets crowded the bag also stops offering the largest shapes. That is deliberate relief, not difficulty scaling — a three-by-three block onto a board with no three-by-three hole is not a challenge, it is a formality.

Scoring

A placement scores one point per square. A clear scores far more, and multiple groups cleared by one placement scale up sharply: two at once is worth three times one, three at once is worth six times. Clearing on consecutive placements builds a streak, and the streak multiplies every clear that follows it.

The consequence is that patient play beats greedy play. Taking a single line now often costs the double you could have taken next turn, and breaking a streak to take a small clear is usually the worse trade. The highest scores come from boards that look alarmingly full right up until they empty in one move.

Reading the board

Three habits separate long runs from short ones.

**Keep one region open.** A board with its space spread thinly in single squares is dead even when it is only half full. A board with a clear three-by-three hole can take anything.

**Watch the dimmed shapes.** A tray piece with nowhere to go is greyed out. That is not decoration — it is the board telling you it has closed a door, usually several turns before the run actually ends.

**Finish boxes, not just rows.** The nine three-by-three boxes are the easiest groups to complete by accident and the easiest to forget. A placement that completes a box and a row together is worth three times either alone.

The daily run

Every day seeds a fresh run. Because the bag reacts to your board, two players who place differently will diverge — the seed fixes where the run begins, not every shape you will ever see. Finishing extends your streak, and the share text carries your score and squares cleared without giving anything away.