Logic Masters Deutschland e.V.

Normal Sudoku rules apply. Signs "bigger than" indicate the lower digit. Digits in cages must sum to the same total. Digits on the positive diagonal (SW to NE) must not repeat.

Lines (orientation given for colour blind): Light green (central cell to NW): German Whisper (difference of at least 5)

Red (central cell to N): Entropic (of 3 adjacent digits one must be low [1,2,3], one middle [4,5,6], one high [7,8,9])

Dark green (central cell to NE): Modular (of 3 adjacent digits one must be "mod 1" [1,4,7], one "mod 2" [2,5,8], one "mod 0" [3,6,9] - "mod" indicating the remainder when divided by 3)

Blue (central cell to W): Block sum (digits in one block must add to the the same sum as digits in anonther block)

Purple (central cell to E): Zipper line (digits in the same distance to the centre of the line add to the central digit)

Pink (central cell to SW): Renban (all digits are consecutive in any order)

Yellow (central cell to S): Nabner (no digits are consecutive in any order)

Orange (central cell to SE): Dutch Whisper (difference of at least 4)

Turquoise (R1C4-R6C9 and R4C1-R9C6): Polarity (digits must alternate between odd and even)

Grey (R5C2-R2C5 and R8C5-R5C8): Palindrome (digits are identical from both sides).

Solve on SudokuPad: http://tinypuz.com/ytfnv7nh