This is a fun puzzle from the July 2026 MathsJams Shout.

1. Shade squares to create walls and complete the map of the dungeon.
2. Printed numbers indicate the number of walls in that row or column.
3. Every unshaded square is either a hallway or part of a treasure room.
4. Treasure rooms are always 3×3 with a single entrance and a single piece of treasure.
5. Hallways are always one square wide. This means that, outside of treasure rooms, there will never be a 2×2 block of unshaded squares.
6. Every dead end contains a monster. Every monster is in a dead end.
7. All unshaded squares are connected into a single contiguous shape.
8. Diagonally adjacent squares are never considered to be adjacent.

Example

These instructions and more puzzles (from zachtronics.com) can be found here. For example, here is a slightly more challenging puzzle.

For an interactive online version see here.

See Dungeons & Diagrams for solutions.