The thing that I do not like about level skipping is that you do not start the level you skip to with all of your weapons. This creates a big problem with level 31, because you usually have to level skip to get there. But, there is a way to get there without level skipping. Go to level 15. When you first start the level, type IDCLIP so you can walk through walls. Now, Run straight foward until you reach a room with a teleporter. Turn IDCLIP off and go in the teleporter. It will teleport you to level 31, and you will have all of your weapons.