Number of Players - servers with 7+ players don't give XP or achievements as of the latest patch.Game Type - this is generally defaulted to Survival.Difficulty - do you want to play Normal, Hard, Suicidal, or Hell on Earth?.There are hundreds of KF2 servers up now, so you have plenty of choices, and the filters seem to be working now too. for credit towards achievements and gaining perk levels).
It all depends on what you're looking for! Right now, the options are rather simple - even more so if you want them to be whitelisted (i.e.
