Underbelly as David. Both Easy and Normal are the exact same route, excluding damage received / Boss HP.

Partners = Jim and Yoko.

• Key from Jim
• Code for Locker (Mens Toilet)
• Locker (B2F Key)
• Power room on B2F (Magnum, Valve, Turn Power On)
• Use Valve + Fix the pipe + Use Valve again (Yoko will keep the zombies distracted here for the most part)
• Grab Emblem outside pipe room
• Breaker Room Puzzle
• Trigger Bugs / Cutscene at Train
• Get Emblem Note (In Control room)
• Use Emblem on train
• Grab the Assault Rifle from the train
• After cutscenes, grab the 2nd Emblem
• Use the Emblem on the Train, then enter
• 30 AR rounds on Boss + Magnum rounds. Ignore the smaller bugs. The fight will take less magnum rounds if you ask Jim for his Lucky Coin, however, it is not needed.