Logic Masters Deutschland e.V.

Normal sudoku rules apply.

Loop: Draw a one-cell wide loop of orthogonally connected cells that does not branch or touch itself, even diagonally. The loop has to visit each 3x3 box at least once.

Digits on the loop determine the direction of the loop:

• On a 1, 2 or 3 the loop turns right.
• On a 4, 5 or 6 the loop continues straight.
• On a 7, 8 or 9 the loop turns left.

The loop goes clockwise around the grid. (I.e., the outside of the loop is always on its left.) See the example image for how the loop moves.

Unfriendly: The loop cannot contain any friendly cells. A cell is friendly if its digit equals its row number, column number, or box number.

Circles: A digit in a circle indicates the number of cells in the 3x3 area centered around the circle which are on the loop, including itself. Not all circles are necessarily given.

Play in the CTC App

Example for reference: