Logic Masters Deutschland e.V.

Each cell of this grid is either Red or Blue. All the Red cells are orthogonally connected; all the Blue cells are orthogonally connected. There are eight of each.

Within the Red region, there are no duplicate digits in the same row, column, or 2x2 box (not counting Blue cells).

The Blue region is subdivided into several areas. Each area of size N contains N copies of the digit N. No two areas which contain the same number are orthogonality adjacent.

Finally, no digit is a knights move away from a copy of itself.

Fill the grid with the digits 1-4.