What Is Hitori?
Medium Hitori is the balanced mode: larger than the beginner grid, but still compact enough to solve without a long session.
The extra row and column create more places where one duplicate decision affects another duplicate group.
This mode is useful for learning how black-cell adjacency and white-cell connectivity can decide between two otherwise plausible duplicate choices.
How to Play Hitori
Medium Hitori rewards cross-checking: do not decide a duplicate in isolation if it also appears in another column or row.
- 1Mark cells white when making them black would touch an existing black cell.
- 2Compare duplicate pairs that share a row or column crossing.
- 3Use connectivity to reject black cells that would narrow the white area too much.
- 4Revisit earlier rows after each black cell because new uniqueness rules may become clear.
- 5Complete the board when every visible number is unique and all white cells still connect.
Medium Hitori Strategy
- •6x6 adds more duplicate interactions without becoming visually crowded.
- •Medium is ideal for practicing white marks as real solving notes.
- •Expect more decisions where adjacency and connectivity are as important as number duplicates.
Hitori FAQ
How is Medium Hitori harder than Easy?
Medium uses a 6x6 grid, so duplicate choices interact across more rows and columns.
Do I need to mark every white cell in Medium Hitori?
No. White marks are optional notes. They help you remember cells that should not be shaded black.
What is different about 6x6 Hitori Medium?
6x6 Hitori Medium changes the grid size and the density of forced black cells, so the solve has a different balance of duplicate cleanup and connectivity logic.
Are all repeated numbers in Hitori black?
No. Repeated numbers tell you at least one copy may need to be shaded, but the adjacency and connectivity rules decide which copy is correct.
Can black cells touch diagonally?
Yes. Black cells cannot touch above, below, left, or right. Diagonal contact is allowed.
What does the white circle mark mean?
A white circle means you have confirmed the cell should remain visible. It is a note for your solve and counts as a final white decision.