Logic Masters Deutschland e.V.

Rules:
⚪ Normal Sudoku rules apply.
⚪ Kropki pairs: Black dots indicate digits in a ratio of 1:2, white dots consecutive digits.
Not all dots are necessarily shown.
⚪ Indexing: Red cells are column indexers, i. e. indicate the position of the cell's column number in that row, e. g. a 7 in a red R2C1 puts the digit 1 in R2C7.
Green cells are row indexers, i. e. indicate the position of the cell's row number in that row, e. g. a 7 in a green R2C1 puts the digit 2 in R7C1.
⚪ Color-Cages: Digits do not repeat in cages. All cells of a specific cage have to be colored the same way red and/or green.

Link: Sudoku-Pad