On "The Pit" in Forge mode, there are four secret places you can get to. When you start, go to the building where the flag is, except in the bottom. Look at the top to see a Jackal's portrait going across. Note: You may need to wait. Then, turn to the orb and fly as close as you can to the window. Spawn a teleporter (receiver) and it will go inside. Once in there, you can put anything desired, but cannot jump or go too far away or you will die.