Hitori three rules, one clean board
Start on the board. Daily, Practice and Campaign stay one tap away; archive, settings, records and the specialist deduction lab stay below the play surface.
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Shade duplicates, keep black cells apart, and preserve one connected white region.
Solved
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More · archive, custom Practice, campaign, assists & local record
Daily archive
The same date always maps to the same verified puzzle.
Practice
60 exact-unique source boards × deterministic symmetry variants.
Campaign
1–30: 5×5 Starter · 31–60: 7×7 Standard · 61–90: 8×8 Challenge.
Assist & display
Rule guardrails never reveal the stored solution. Hint and Check mark the run Assisted.
Local record
Remove duplicate white numbers
Each visible number can appear only once in every row and column.
Black cells never share an edge
Diagonal contact is fine. Horizontal and vertical black neighbors are not.
White cells stay connected
Every unshaded cell must remain in one orthogonally connected region.
Black means remove · circle means keep
Use explicit Shade and Keep tools, or long-press/right-click to mark a cell as definitely white.
Reason first, exact continuation second
Hints prefer named deductions, then use current-state exact logic to find a forced next cell.
Autosave, streaks and best times stay on device
No account is required. Leaving the tab pauses time automatically and preserves the board.