I'm working on a custom mappack that's overloaded with enemies, but not impossible. It's called "2 Many Enemies". So far I've made from 1-1 to 1-4. It'll contain 32 levels, and a few jokes(I put Lol, 69 on 1-1, Underwater Trees on 1-3, etc.(Note: The Level Number has nothing to do with the jokes)). It also will contain some puzzles like in Portal, but they won't be as complex as the Portal Mappack.