Logic Masters Deutschland e.V.

Rules:

Colorguru rules apply: Some cells in the grid have been colored blue, green, purple, red or yellow. Using those 5 colors, color some more cells in the grid. Every colored cell belongs to a Block, which is 1 to 5 orthogonally connected cells of the same color. Blocks of the same color or size cannot touch orthogonally or diagonally. Every Block belongs to a Region, which is 2 or more orthogonally connected Blocks. Blocks within a Region cannot be the same color or size. Regions may not touch orthogonally. Regions that touch diagonally have at most one color in common.

Additionally the shape of each Region must be rotationally symmetric about a central point. (Colors in a region do not have to be rotationally symmetric). A white circle indicates a known center of a Region, but not all white circles are given.

Solve on SudokuPad (No answer check)
Solve on F-Puzzles
Solve on Penpa (with partial answer check)

Puzzle: