Logic Masters Deutschland e.V.

So ChinStrap came up with this concept for a Doppelgänger puzzle and it just had to happen. Hope you like it!

• Doppelgänger Sudoku:
  • Fill each cell of the main 9x9 grid such that every row, column and 3x3 box contains a 0 and eight different digits from 1-9.
  • No two rows, no two columns and no two boxes may be missing the same digit.
  • For each 0 in the grid, the digits missing in its row, column and region must be three different digits.
  • Fill each outer cell with the digit missing from the corresponding row, column or box.
• Dutch Flatmates: Every 5 in the grid and note spaces must have a 1 directly above it, or a 9 directly below it. It may have both, but it doesn't need both. For note space cells and grid edge cells consider the closest cell above or below it.
• A grey or gold line can be split into non overlapping segments with the same sum. That same sum is 10 for grey lines and 11 for gold lines.

Online in Sudokupad.

See also:

• hesperus garden
• don't hurt yourself (ft. Calvinball)
• the year of the dög
• alte karte / ferneiland
• got too many pages stuck together + zuul with ThePedallingPianist
• split pearsonality / dopealgänger