Logic Masters Deutschland e.V.

Rules:

Torus: The grid is toroidal. Each edge of the grid is considered to be adjacent to its opposite edge.

Snake Ball: A snake is a 1-cell wide region of up to 9 orthogonally connected cells. EACH SNAKE touches orthogonally ALL OTHER SNAKES. Snakes does not branch and does not touch themselves.

Fillomino: Divide the grid into several snake-shaped regions. No two snakes have the same length. Write the length of each snake into each cell as that cell's value.

Kropki: Black dots connect cells with a 2:1 ratio. White dots connect cells with consecutive digits. ALL DOTS ARE GIVEN.

Sample solution (maximum snake length is 6):

Snake Ball puzzle (maximum snake length is 9):

Solve online on Penpa+ or SudokuPad.