Logic Masters Deutschland e.V.

RV 315 is the Summer concert in The Four Seasons by Vivaldi.

This is the very first puzzle that I publish and the second puzzle I ever set. I would really appreciate some feedback. Happy solving!


Rules:

*Place the numbers 1-9 in every row, column and region.

*Regions are a group of 9 cells orthogonally connected. Regions must be drawn by the solver.

*Orange lines are Entropy Lines. Each set of 3 adjacent cells in an Entropy Line must contain one low (123), one middle (456) and one high (789) digit.

*Each individual cell in a line belongs to a different region. Different lines can have cells belonging to the same region.

Digits in a circle count the number of cells (including itself) belonging to the circle's region seen vertically and horizontally.

Additionally, given digits have the anti-knight constraint. Given digits cannot repeat a chess knight's move from themselves. This ONLY applies to given digits.