Logic Masters Deutschland e.V.

This is a set of puzzles I prepared as a gift for Flinty for the 2025 Secret Puzzle Santa at the CTC Discord server. Hope you like it!

• Normal sudoku rules apply.
• Dutch Flatmates: Every 5 in the grid must have a '1' directly above it or a '9' directly below it. It may have both, but it doesn't need both.
• For each puzzle outer clues follow two rules out of Hitpoints, Periodic Sum and Up-to-N. There are tabs on the upper left to remind which ones are at use.
  • Hitpoints: Clues outside the grid give the sum of all cells that contain a digit equal to the distance of that cell from that clue in the row or column.
  • Periodic Sums: A clue outside the grid indicates the sum of the first cell seen in its row or column and every Nth cell after, where N is the digit in the first cell.
  • Up-to-N: A clue outside the Row or Column N indicates the sum of all digits up to the cell that contains the digit N. (The digit N itself is not included in the sum.)
• A digit in a circle indicates exactly how many circles contain that digit.

The puzzles are linked through the finish messages in sudokupad. The following is the link to the first puzzle:

Online in Sudokupad.

See also:

• watskeburt
• huisgenoot gezocht
• bewuste sabotage
• zauberschein
• Top Right Boi
• dissipation gradation