Things You'll Need
Instructions
Familiarize yourself with the leveling requirements for each perk. For instance, the "Commando" perk must use the bull pup assault rifle to level up while the "Berserker" perk must use melee weapons to deal a certain amount of damage to enemies. Use the appropriate weapons for the perk that you want to level.
Download and install the "KF Faked Players" mutator. "Killing Floor" creates a number of enemies in the game according to the number of players; the "KF Faked Players" mutator is a modification that creates more enemies, as if there were more more players in the game. The increased number of enemies allows players to level their perks faster by providing more opportunities to earn points. The mutator is whitelisted by the "Killing Floor" developers, they have tested it and approved it for use.
Start a new "Killing Floor" solo game with the "KF Faked Players" mutator activated. Playing solo games allows you to level up your perks without worrying about other players taking points from you. Maximize your efficiency in leveling by using the appropriate weapons for each perk. Any perk progress you make playing solo games will carry over to multiplayer games.