Crusader No Regret Easter Egg - Red Demon

When you get to the Ore Separator, don't blow it up immediately. Instead, jump across the conveyor belts onto the other side of the platform. Walk south and use the keypad there. Then walk down the platform some more until you come to the health machine. Next to the machine there is a pad on the floor. Step on it and destroy the trap. Step on the pad again. Now use the telepad.
You'll emerge on an area with Di-Cor. Keep walking and you'll get to a corridor full of weapons (all the weapons in the game are there) and ammo and other items. Pick up everything you need and return to the intersection. Keep walking east and you'll come to another corridor. Stand between the two railings and a door will open. In this new room there is a big demonic five pointed star. A demon will emerge from the star and threaten you. Just shoot him and when he dies the photo of one of the developers will appear.