Logic Masters Deutschland e.V.

SudokuPad link (via tinyURL)

Normal Sudoku rules apply. Place the digits 1 through 9 in each empty cell. Digits must not repeat within the same row, column, or box.

Doublers: each row, column, and box has one doubler cell. Digits on a doubler count as twice their normal value. Each digit 1-9 is doubled once;

X-sums: clues outside the grid indicate the total of the first X cells in that row or column, where X is the value of the first cell in that row or column. Values greater than 9 do not count any more than the first 9 cells;

Cipher: Each letter corresponds to a unique digit (0-9) which must be determined by the solver. The outside clues, therefore, might range from 00 - 99 (though the maximum sum of a row or column can't be quite that large) .