Logic Masters Deutschland e.V.

tl;dr - LITS + Moon or Sun

Shade four cells in each region to form a tetromino. All shaded cells must form a single orthogonally connected region with no 2x2 squares of shaded cells. A tetromino may not share an edge with another tetromino of the same kind (including rotation and mirroring).

In each bordered region, you must either shade all Moon cells, or shade all Sun cells. The region of shaded cells must be traversable as a loop that passes through each bordered region once, without visiting two consecutive regions where the Moons or the Suns are shaded in both of them. Not all shaded cells must be on the looping path, but the looping path must exclusively be on shaded cells.


Solve on Penpa+