I said round before, but that's probably the incorrect word to use. If you fail a map, at whatever point, you can restart which doesn't take you out and force you to make a new lobby. It just starts you again at the begging wave for that map. If you don't wish to retry, you then do need to make a new lobby. It's not great, the code is 6 letters long, but we've just been reading it out. It's just such a daft way of doing it, especially since co-op doesn't feel like an afterthought except for that one thing.Sounds like a right PITA. I doubt I'll give it a go then, only would be interested in co-op for it.