All levels unlocked.
What's a demon to do when the end of the shift is nearing and they haven't yet met their daily quota of stolen human souls? Fruit just isn't the temptation it used to be, and going down to Georgia is way too risky. Oh, and there happens to be a dangerous human wizard on the loose who wants to make your life He... erm... Heaven. But one small demon, specifically the one starring in Olip's Inner Demon: Soul Trader, is ready to become the villain Pandemonium deserves by possessing as many people as people as possible. In puzzle game fashion, no less. Mwahahaha. In fact, he's not merely content to tackle one type of puzzle; his delightfully dark adventure will see him both skidding around the room in a sliding block fashion when he's his demony self, and pushing objects in a more controlled, Sokoban-like manner when he's possessing some poor slob. Just use the [arrow] keys to make him zip along the floor until he hits something; preferably a tasty human. Once you've captured a terrified victim, you can walk them back to your portal to Hell in a more controlled fashion... if you don't need them to gather gems, push buttons, and break floors for you first. You'll have to combine you speedy sliding skills and your human-manipulating prowess to reach that wizard king and make things safe for demonkind! It's a simple idea, and it's the kind that works so nicely (or evilly) you have to wonder what took the world so long.