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| Mutator | Author | Info | |
|---|---|---|---|
| Kakutou 2 | Unknown | 2 mutators , 1 weapon | |
| Kakutou102 | Unknown | 2 mutators , 1 weapon | |
| Kakutou102 Umod | Unknown | 2 mutators , 1 weapon | |
| KangRegenSB | Unknown | 2 mutators | |
| KautSniperRifleV1 | Unknown | 1 mutator , 1 weapon | |
| KeepIt | Unknown | 1 mutator | |
| Kick Idle-Players V2 | Unknown | 1 mutator | |
| Kick Idlers | Unknown | 1 mutator | |
| Kick The Stuff | Unknown | 1 mutator | |
| KickASS Project Demo | 4DTeam | 1 mutator | |
| Kickback | Unknown | 2 mutators | |
| Kill 2 Heal 3 | electronic means | 1 mutator | |
| Kill 2 Heal 4 | electronic means | 1 mutator | |
| Kill to Heal 2 | Unknown | 1 mutator | |
| Killing Spree Bonus | Ira "Wizard" Taraday | 1 mutator | |
| Killing Spree Multiplier | Unknown | 1 mutator | |
| King Of The Arena v155 | {KiX}ProfessorGib | 1 mutator | |
| KingOfTheArena | Unknown | 1 mutator | |
| Kod | Unknown | 3 mutators | |
| kx DoubleJump | Unknown | 1 mutator |