Select "Team Bagman" and go to the level "Relentless". Set the options as follows:
Weapons: Pistol to default, rail driver Score limits: 500 More bots possible No power ups No reloads Unlimited ammo Difficulty: Easy or create some bots and make them easier and make their first liked weapon to pistol. Have yourself alone in your team, and all bots are in the other.
Try findingthe rail driver and the bag then go to the large room where is the large hole on the roof. Go to the small room on your left when you come from the little jump room. Next, stay as hidden as possible. The stupid bots will appear. Continue firing so that when the bots appear, they will freeze in place and cannot hit you. If you wait until at least four bots are stuck like that, you will have unbelievable performance.