Logic Masters Deutschland e.V.

I made this puzzle following Scojo's prompt to use anti-diagonal constraint along with entropic and modular lines.

• Normal sudoku rules apply.
• If a digit is on a red diagonal then it must appear three times on it.
• Any three consecutive cells along a green (modular) line must contain one digit of each residue class modulo 3: {147}, {258} and {369}.
• Any three consecutive cells along a yellow (entropic) line must contain one low digit {123}, one medium digit {456}, and one high digit {789}.
• Digits joined by a black dot are in 1:2 ratio.
• Digits joined by a white dot are consecutive.
• Digits joined by a yellow dot are both low {123}, medium {456}, or high {789}.
• Digits joined by a green dot are both in the same residue class modulo 3.
• Not all possible dots are given.

Online in Sudokupad

More modular+entropic:

• el quinto sol