Logic Masters Deutschland e.V.

The Cavern Crawl series continues with smaller caverns in this 6x6 puzzle. If you have solved Cavern Crawl 1, 2, or 3, make sure to read the rules for this puzzle as they are slightly different.

Rules:

Normal 6x6 Sudoku rules apply: each row, column, and 3x2 box must contain the digits 1 to 6. Cages are used to distinguish each 3x2 box.

The cell with a circle must contain an odd digit.

Horizontally and vertically adjacent digits must have a difference of 2 or less except when separated by a “wall” (thick black line). Adjacent digits separated by a wall may have any difference. A 3x3 example is provided below.

You can solve online using Penpa+ or F-Puzzles.