Setup and opening position
Every cell begins with a fixed number from one through five and an undecided shade mark. Repeated values may occur within a row or column, creating the choices that define the puzzle.
Hitori
Find the unique pattern of black and white cells that satisfies duplicate, adjacency, and connectivity rules together.
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How to play
Find the unique pattern of black and white cells that satisfies duplicate, adjacency, and connectivity rules together.
- Every cell begins with a fixed number from one through five and an undecided shade mark. Repeated values may occur within a row or column, creating the choices that define the puzzle.
- Mark cells black or white. No number may repeat among the white cells of a row or column, black cells may not touch orthogonally, and all white cells must remain orthogonally connected.
- Find the unique pattern of black and white cells that satisfies duplicate, adjacency, and connectivity rules together.
Strategy tips
- Compare repeated numbers first, then use the no-touch rule to force neighbors of every confirmed black cell white while checking that a proposed shade does not cut the white area in two.
- Removing every visible duplicate independently can isolate a white corner or place two black cells side by side, so each shade must be checked against all three rules.
- When only a few cells remain undecided, trace a single orthogonal path through every white cell before resolving the last duplicate pair.
Complete guide
Rules, scoring, and strategy
Hitori is a complete browser implementation with its own versioned rules profile. Shade selected cells in a five-by-five number grid so duplicates disappear without breaking the white region apart.
Legal moves and game flow
Mark cells black or white. No number may repeat among the white cells of a row or column, black cells may not touch orthogonally, and all white cells must remain orthogonally connected.
Winning and terminal positions
Find the unique pattern of black and white cells that satisfies duplicate, adjacency, and connectivity rules together. When only a few cells remain undecided, trace a single orthogonal path through every white cell before resolving the last duplicate pair.
Practical strategy
Compare repeated numbers first, then use the no-touch rule to force neighbors of every confirmed black cell white while checking that a proposed shade does not cut the white area in two. Removing every visible duplicate independently can isolate a white corner or place two black cells side by side, so each shade must be checked against all three rules.
Questions players ask
What is the objective in Hitori?
Find the unique pattern of black and white cells that satisfies duplicate, adjacency, and connectivity rules together.
Which moves are legal in Hitori?
Mark cells black or white. No number may repeat among the white cells of a row or column, black cells may not touch orthogonally, and all white cells must remain orthogonally connected.
What should I plan first in Hitori?
Compare repeated numbers first, then use the no-touch rule to force neighbors of every confirmed black cell white while checking that a proposed shade does not cut the white area in two.