The Rule
Two cats cannot occupy neighboring cells. That includes left, right, up, down, and all four diagonals.
Meowdoku Garden
Meowdoku specific rule
Understand the Meowdoku no-touch rule, including diagonal blocking, assist dots, common mistakes, and solving opportunities.
Side contact is illegal. Diagonal contact is illegal. Assist dots reveal blocked cells.
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Two cats cannot occupy neighboring cells. That includes left, right, up, down, and all four diagonals.
Diagonal contact is easy to miss because the cats do not share a row or column. Meowdoku still forbids it.
Assist mode adds black dots around placed cats so the no-touch pattern is visible while you learn.
A no-touch mistake tells you which area was over-crowded. After the heart changes, rescan nearby rooms.
The no-touch rule is not only a restriction. It can force cats by eliminating surrounding alternatives.
No. Diagonal touching is forbidden.
No. It only shows cells that are already impossible.
Most likely the new cat conflicted with a row, column, room, or neighbor rule.