Sto-stone is a Nikoli-style gravity puzzle. The grid is divided into rooms. You fill cells black. The number in a room shows how many continuous black cells it contains. When all stones drop straight down, they must fill the bottom half of the grid.

How do you play Sto-stone?

Click cells to fill them black or white. Black cells within a room form connected groups. The clue number shows the size of the largest connected group. Black cells cannot touch across room borders. When gravity drops all stones down, they fill exactly the bottom half.

What are the rules of Sto-stone?

1) Each room may have a number indicating its largest connected black cell group. 2) Black cells cannot connect across room borders. 3) When all black cells drop straight down, they must fill the bottom half completely with no gaps.

How many levels does Sto-stone have?

30 levels across 5 tiers: Beginner (4x4), Easy (4x5), Medium (4x6), Hard (4x7), and Expert (6x6).

Is Sto-stone free to play?

Yes! Sto-stone on GameZipper is completely free. Play instantly in your browser with no download required.

Sto-stone - Gravity Stone Logic Puzzle

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