Leave a little
room to flow.

Shade the repeats. Keep the white connected.
A quiet moment, one square at a time.

● shaded○ kept· undecided

THREE RULES. ONE GOOD FLOW.

No repeats. Shade cells so a number appears at most once in each row and column.
Give ink some space. Shaded cells cannot share an edge. Corners are fine.
Keep it together. Every white cell must connect to every other by an edge-to-edge path.

Repeating pairs

Touching ink pairs

White regions

CHOOSE YOUR MARK, THEN TAP A CELL

How to find your first move

Two equal numbers with one cell between them? The middle cell must stay white: shading it would force both copies to stay and repeat.

Two equal numbers next to each other? Any other copy of that number in their row or column must be shaded.

A white cell is not required to contain every number: gaps are allowed. A Keep circle is a pencil reminder, not an extra rule. You win as soon as all three rules hold.

Controls & credits

Tap a square to apply your chosen mark; tap again to clear it. Right-click toggles a Keep circle. Arrow keys select a cell. X shades it, C marks it kept, Delete clears it, U undoes. Space applies your chosen mark.

Fifteen uniquely solvable islands in 5×5, 6×6 and 7×7. Reveal one marks a single cell and labels the island assisted. Restart can be undone. Progress saves on this browser.

Adapted from Singles (Hitori) by James Harvey in Simon Tatham’s Portable Puzzle Collection. Original MIT C generator and solver, with a new static browser interface. Source: chrisboyle/sgtpuzzles, app/src/main/jni/singles.c. MIT license & credits.

Leave a littleroom to flow.

One connected island.

Leave a little
room to flow.