73
62
71
54
65
67
52
75
52
79
Tap a square to see where the knight could step next.
No numbers. Ten sums. One answer.
A hidden knight's tour numbers every square. The margins print the sum of each row and column. Restore the tour.
A puzzle with a proof
Every board is certified to have exactly one solution. The Sunday empty grid is possible because a tour and its reverse only share sums when the tour is semi-magic.
Any board
- Flat
- Torus
- Cube
- Möbius
- Hex
- Goban 19×19
From Beverley to Funk
- 1848 — Beverley's semi-magic tour: a property.
- 2026 — Funk turns the sums into a clue.
- Today — a certified genre, one answer per board.