Logic Masters Deutschland e.V.

In this puzzle, you need to replace each letter A-J with a unique digit from 0-9, and then solve each puzzle. Each letter must have the same value across all puzzles.

Each domino is a magnet, which is either charged or uncharged. If a magnet is charged, then one half is positively charged, and the other half is negatively charged. No two cells with the same charge may touch orthogonally. Clues above and to the left indicate the total number of positive and negative charges found in the row or column.

Draw a closed loop along the edges of some cells that does not touch or cross itself. Clues above and to the right of the grid indicate the total number of edges used by each connected group of cells inside the loop in the respective row or column. Where clues are given, they are complete and in the correct order. ? replaces a value from 0-9, and ?? replaces a value 10 or larger.

Place stars into some empty cells such that every star has at least one arrow pointing towards it, and every arrow is pointing towards at least one star. Clues to the left and below the grid indicate the total number of stars in the respective row or column.

Draw a totally connected loop network that travels orthogonally between the centers of cells and does not have any dead ends. Clues to the right and below the grid indicate the total number of turns, straight segments, branches, or crosses in the respective row or column.

Examples for each ruleset can be found here.

Note: Each clue given is off by one, either too large or too small.