A number at a corner says how many diagonals touch that corner, from 0 to 4.
The diagonals never form a closed loop, however large.
Corner Numbers
Every cell gets a diagonal, / or \. A number at a corner says how many diagonals touch that corner, from 0 to 4.
✓ Correct
All four diagonals meet at the 4; the outer corners have 1 and 0.
✗ Wrong
Only three diagonals touch the 4.
No Loops
The diagonals never close a loop, small or large.
✓ Correct
Diagonals that branch and wander but never close a loop.
✗ Wrong
Four diagonals close a diamond: a loop.
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