11: Half-Life

Equip HEV suit, equip crowbar, kill headcrab, climb ladder, fall off ladder, major lacerations detected, climb ladder again, jump, jump, pick-up magnum, shoot zombie scientist, shoot bull squid, refill health, talk to Barney — oh no! They killed Barney! — crawl through ducts, headcrabs! Shoot shoot shoot, ammunition depleted, equip crowbar.