Get the key and take the top exit. Up. Get through the random maze. Up. Up. Right. Down. Right. Down. Right. There is a section of the castle with cracked walls. Blow it up with a bomb to get through. Up. Left. Up. Walk up to the picture with a black monster on it and the wall will disappear. Take the left exit. Up. Left. There is a food bonus here. Make sure you get the potion first. Take the right exit. Up. Random maze. Walk through the walls and take the left exit. Left. Dodge the arrows and continue to the left exit. Down. There are a series of arenas here that look identical. Each time you take the bottom exit, it appears as if you are still in the same arena. Keep going down until you find the key and return to the top. Right. Right. Open the door with the key and take the right exit. Down. Right. Down. Walk through the wall on the right. The wall next to the window can be pushed out and moved around. Push it and get the key in the next room. Open the door at the bottom and take the right exit. Up. Random. Left.
Take the transporter into the room with the Minotaur. Dodge the rolling rocks. Stay towards the back of the arena and fire at him from a distance. If you get close he will throw fireballs at you. If you have some chaingun ammunition left us that as he's real tough. Don't move around too much as there are a large number of Goolyns around. Kill the Minotaur and you've completed the game.
The End!