Featured Puzzle: One or All #5 – Monster Mash

After a late night working in the lab, you looked out from the balcony and found an eerie sight! Three types of local monsters have begun arranging themselves into groups. The rules seem pretty simple, but where will the rest go?

• The grid is divided into 3-cell regions. Each cell must contain one monster.
• Each region must contain either three monsters of the same type, or one each of all three different monsters.
• Orthogonally adjacent cells of different regions may not contain the same monster.