Logic Masters Deutschland e.V.

Rules:

Each level contains the digits 1-4 exactly once in each row and column of the 4x4 grid (Latin Squares). The four levels are positioned on top of each other (from top to bottom) and together form the "Latin Cube", where each "stack" (same position on the 4x4 grid, but different level) contains the digits 1-4 exactly once. Digits in Killer Cages can not repeat and sum to the small clue in the corner of that cage. Additionally digits can not repeat on the four diagonals through the center of the cube (the corresponding cells are coloured to help with the solve).