THE PLAYBOOK · QTHCC
How to play Hitori
For Hitori, QTHCC puts the actual rules alongside the playable board or activity. Shade repeated numbers while keeping black cells separated and all white cells connected. The suggested practice focus is read the feedback.
Twelve checked 5×5 boards; fixed black starter squares cannot be changed.
Read the feedback
Status messages explain the current state and rejected actions. Check them when an action does not behave as you expected.
Your goal
Shade repeated numbers while keeping black cells separated and all white cells connected.
Step by step
- Click a cell to shade, mark or clear it.
- No unshaded number may repeat in a row or column.
- Black cells cannot share an edge.
- Check puzzle verifies duplicates and connectivity.
Controls
Click or tap squares or graph edges. Number boards include a digit pad. Undo reverses the previous change; Check puzzle validates the solution.
A useful example
Two identical unshaded numbers in one row cannot both remain.
Watch out for this
Removing every duplicate can disconnect white cells.
Common questions
What is included in this edition?
Twelve checked 5×5 boards; fixed black starter squares cannot be changed.
Which controls should I use?
Click or tap squares or graph edges. Number boards include a digit pad. Undo reverses the previous change; Check puzzle validates the solution.
Can you show a concrete example?
Two identical unshaded numbers in one row cannot both remain.