Logic Masters Deutschland e.V.

This is an older puzzle, and I think this was my first use of the Anti-palindrome constraint. Please leave a comment below what you thought of this puzzle. Difficulty is around 2.5/5 I think. There is a tricky bit in the middle.

Normal sudoku rules apply.

Diagonals: each of the main diagonals must contain all of the digits 1 to 9.

Between line: all digits on the line must have values strictly between the values of the circles at the ends of the line.

Thermometer: values of cells on the thermometer are strictly increasing from the bulb end.

German whispers line (Green): consecutive cells along the line must have a difference of at least 5.

Renban line (purple): cells on this line have values that form a set of consecutive numbers, in any order, with no repetition.

Palindrome line (grey): cells equidistant from the middle must have the same value eg 146641.

Anti-palindrome line (red): cells equidistant from the middle must have values which sum to 10 eg 421986. Equivalently: the Nth digit from one end plus the Nth digit from the other end must sum to 10.

F-puzzles

Sudoku pad