The University sends Joel and Ellie on horseback across the University of Eastern Colorado near Boulder, looking for the science building where Tommy says the Fireflies are based. It mixes quiet exploration with a dorm full of infected and a fight against armed looters inside the lab building.
Part 8 of 12 in Main story
1. Go Big Horns: the campus, the dorm and the gate generator. 2. Science Building: the empty Firefly lab and the fight with looters.
You ride Callus across campus while Joel opens up a little: he wanted to be a singer, never went to college because he became a father young, and he explains football to Ellie. To open a locked gate, Joel goes alone through a dorm packed with infected to start a generator. The only living things you see out in the open are monkeys in a square, and Joel guesses the Fireflies leave the infected around as a defense, the way Bill used his traps.
Most of the collectibles are on the campus: five artifacts (a newspaper clipping, a snipers' nest log, a student's journal, the UEC campus map and a wall panel note), four pendants (Griggs's, H. Pino's, Rohner's and Warren's), the comic Free Radicals and the manual Health: Sterilization.
Inside, the Fireflies have clearly left in a hurry. A recorder by a dead scientist explains they were testing the infection on monkeys, and that he was bitten while trying to free them instead of putting them down. Another recording says the group has moved to Salt Lake City. Then looters ambush you, and you fight floor by floor through the building. The Firefly's recorder, lab and office recorders, fungal X-rays, Hickman's pendant and Molotov: Deployment are in here.
A looter bursts through a door and drags Joel over a balcony with him. The looter dies in the fall, and Joel lands on a length of rebar that goes through his side. Ellie helps him up, guards him on the way out, and shoots a looter trying to take Callus. They ride off, but Joel slumps and falls from the horse, and the chapter ends with Ellie begging him to tell her what to do.
Image: Naughty Dog / PlayStationLakeside Resort
Lakeside Resort jumps to winter and puts you in control of Ellie near Silver Lake, Colorado, hunting with a bow and searching for medicine. She runs into two strangers, David and James, and for part of the second half the game switches you back to Joel.
Tommy's Dam
Tommy's Dam brings Joel and Ellie to Jackson County, Wyoming, months after Pittsburgh, where they find Joel's brother Tommy helping run a hydroelectric plant for his wife Maria's settlement. It is a short chapter built around a reunion and two fights with bandits, one at the dam and one at an old ranch house.
Back in a Flash
Back in a Flash is the first chapter of Left Behind. After a short flashback to Riley's surprise visit at Ellie's school in Boston, you play Ellie in the snowed-in Colorado Mountain Plaza, searching the mall for anything that can help Joel.
Escape from Liberty Gardens
Escape from Liberty Gardens is the final chapter of Left Behind: Ellie and Riley run from a horde of runners through the Boston mall, climbing scaffolding to find a way out. It has no collectibles, and finishing it unlocks the gold trophy Don't Go.