Enable the give all code. Go to any level and get all the enemies to follow you. Run into a corner with them in front of you. Press TAB button until you see "AD bomb" or something similar, then press ENTER. All the enemies must be in front of you. This will freeze all the enemies and allow you to walk around with no problems.
Multi-player LEVEL - CHEAT CODE The Low Road - rdm1 The High Road - rdm2 Boxed In - rdm3 Razor Close - rdm4 Stone Hinge - rdm5 Nexus - rdm6 Sewer Citadel - rdm7 Styx and Stones - rdm8 Scenic Overlook - rdm9 Great Divide - rdm10 Dish It Out - rdm11 Fall From Grace - rdm12 Roads To Nowhere - rdm13 Rogue's Edge - rdm14
Other maps LEVEL - CHEAT CODE Weapon and ammo depot - runit2 Weapon and ammo depot - runit3 Weapon and ammo depot - runit4