Logic Masters Deutschland e.V.

Normal sudoku rules apply.
For each digit N, the position of N in box N is equal to the position of N in row N plus the position of N in column N (e.g. if the 8 in row eight is in r8c3 and the 8 in column eight is in r4c8, then the 8 in box eight would be in the 7th position (3+4), which is r9c4).
Digits in cells with a shaded square must be even.
Digits in cells with a shaded circle must be odd.
Digits in cells separated by a black dot have a 1:2 ratio.

SudokuPad | F-Puzzles

Giving this the 159 tag because (as far as I can tell) there's not a more general tag for indexing. If you came here expecting a 159 puzzle, sorry! But a lot of the logic is pretty similar. Anyway, if you or someone you know might enjoy a weekly set of puzzles that are pretty approachable by LMD standards (much more so than this one!), check out Artisanal Sudoku. Primarily killer sudokus, often in combination with other rulesets.