Logic Masters Deutschland e.V.

Rules:

Divide the grid into regions of orthogonally connected cells. Each cell should contain a digit equal to the size of its region (i.e. the number of cells in its region). No two regions of the same size may share an edge but may share a corner.

Each region contains exactly one of the given knightlights. Yellow knightlights are on. Gray knightlights are off. A cell with an on knighlight contains a digit indicating exactly how my times that same digit appears a chess knight’s move away from that cell. Cells with an off knightlight strictly do not have this property (e.g. an off knightlight with a four is disallowed from seeing exactly four fours by knight's move, but it may see more or fewer). Off knightlights do contain given digits to help out in the dark.

To Play:
SudokuPad