Logic Masters Deutschland e.V.

Since I first solved a 159 sudoku I wanted to make one where you have to deduce which columns are used for column indexing, and I finally got around to doing that (plus also row indexing).

Rules
Standard Sudoku: Place a digit from 1 to 9 in each cell so that each row, column, and outlined box contains exactly one of each digit.
Entropic line: Any set of three sequential cells along a peach line must contain a low digit (123), a middle digit (456), and a high digit (789).
Kropki pairs: Digits separated by a black dot must be in a 2:1 ratio. Digits separated by a white dot must be consecutive. Not all dots are necessarily given.
Column indexing: For each column which has a middle digit (456) in row 1, all of the cells in that column are column indexers. A column indexing cell in row R and column C containing a digit D will place a digit C in row R column D.
Row indexing: For each column which has a high digit (789) in row 1, all of the cells in that column are row indexers. A row indexing cell in row R and column C containing a digit D will place a digit R in row D column C.

Solve Online: Sudokupad