Cluk is a LG System Puzzle Planet that has stipe shaped clouds and is shaped like a shrivelled up lemon. As it is a puzzle planet, it blows apart at a certain time in its year, and then re forms at the same point a year later. On the splitting day, all commutitive activity stops, spaceports close, and doors lock. An hour before the Big Split, everyone is told to go home, and if they are too far away to make it in time, they are advised to leave the planet.