Hitori Solver
Solve a Hitori puzzle by finding which numbered cells to shade.
Hitori starts from a grid of numbers. You shade cells so that no number appears more than once among the unshaded cells of any row or column, no two shaded cells touch edge to edge, and every unshaded cell stays connected to the rest. Type the puzzle's numbers into the grid below and solve to see which cells to shade.
Fill every cell with the puzzle's numbers.
How it works
The solver decides each cell shaded or unshaded in turn. It never leaves a number unshaded if the same number is already unshaded in its row or column, and it never shades a cell next to an already shaded one. Once the whole grid is decided, it checks that the unshaded cells form one connected region.
A proper Hitori puzzle has a single solution; the solver reports when more than one shading works.