Logic Masters Deutschland e.V.

The Rules:

1. Normal sudoku rules apply. Fill every row, column, and 3x3 box with the digits from 1 to 9 once each.
2. [Numbered Room] A numbered room clue indicates the number that is x cells into the row/column from the direction of the clue where x is the digit in the cell next to the clue. The numbered room clues must be deduced.
   • Ex: in the row 317892456, there would be a 7 to the left of the row, and an 8 to the right of the row.
3. [Sandwich] A sandwich clue indicates the sum of the digits sandwiched between the 1 and 9 in that row or column. The sandwich totals must be deduced.
   • For example, in the row 317892456, the sandwich sum would be 7+8 = 15.
4. [Operations] Symbols outside the grid indicate how the Numbered Room clues for that row/column can be calculated to produce the Sandwich clue for that row/column. Not all clues are necessarily given. If more than one symbol is shown for a row or column, they must both be true.
   • Example: In this puzzle, a row 317892456 could be clued with a +, because the numbered room clues of 7 and 8 can sum to the sandwich sum 15.

The Puzzle: Try it on CTC's sudoku pad. or at or try this one with room to type outside clues. (no promises answer check works though...)