Hobo 13

The harsh and dry planet of Hobo 13 serves as a training planet for soldiers. Other-worldly trainees hoping to become skilled soldiers come here to participate in a series of trials. Zim was sent here by the Tallest to prove he could pass in order to get a shipment of military equipment. The trials to become a soldier are to get across a molten pit of hideous creaming pain, navigate across a canyon that is home to the meat-thirsty Hogulus, get through a laser trench, cross a pool of acid, find the way out of a maze where a robotic snake-thing lurks, and get past a swamp full of plant monsters until finally reaching the Fortress of Pain.After reaching the Fortress of Pain, you come to an arena.It has a laser-fence which you fight against other trainees that have survived.If you get hit toward the laser, or past the laser, you lose and...die.