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 Conversation #32 – Joel will talk about teaching Ellie guitar right near the start. After which Ellie will display a  above her head which you can then initiate the conversation with.

 Artifact – Family Photograph – Right at the beginning of the Highway Exit chapter there is an RV that you can enter to find this photo.

 Conversation #33 – Just to the right of the RV there will be a bus on the right side with an advertisement for Air West airlines. Ellie will stop near it and give you the opportunity to talk to her about it.

 Firefly Pendant – Katerina Perich -Walk down the off ramp of the highway and at once you reach the end walk around the white car and this will be at the corner of the off ramp.

 Artifact – Note to Wife – After climbing over a bus and looking out at the hospital in the distance, you will cut through a bus station. Take the stairs down on the left and keep straight and you’ll see this on the ground among some luggage.

 Conversation #34 – Inside the bus station, Ellie will sit on a bench. Talk to her before grabbing the ladder. Then hit the conversation trigger on the ladder itself.

 Conversation #35 – You will encounter an “Animal” close up. Walk up to it and hit 

 Conversation #36 – And just a bit further from the previous trigger, you will make it up to a roof. From here you can press  to initiate this conversation.

 Comic Book – Precipitate – After seeing some “unexpected” animals, you will take some stairs down that lead to a larger room. In this room is a public bathroom with a comic book in front of one of the stalls.

 Toolbox #5 – When you enter the Triage area with all the tents, head to the large tent on the left side of this area. Enter the largest tent and this will be just to the right.

 Firefly Pendant – Nicole Hoo – When you get back out side after traveling through the bus depot, there will be a large white triage tent. To the right of that is a smaller blue tent and to the right of that is a green tent. In front of the green tent is a light fixture that has the pendant that you need to shoot down.

 Artifact – Salt Lake Q.Z. Map – This is located under the white tent to the right of the bus that you will have to travel through to get to the next area.

 Artifact – Joel & Sarah Photo – This is given to you by Ellie when you engage in her optional conversation near the bus

 Conversation #37 – This will be earned when you get the Joel & Sarah artifact.

 Firefly Pendant – Natalie Hoo – After climbing through the bus to a new location, continue forward until you see another bus. This one you can’t go inside of, but if you follow it around to the opposite side you’ll find this pendant.

 Training Manual – Bombs: Shrapnel – While in the roadway tunnels, you will be greeted at the end of it by two bloaters and a several other enemies. At the conclusion of this, jump onto of the white truck in the middle of this area.

 Comic Book – Catalysis – After swimming under and through a bus and climbing up to drop a ladder for Ellie, stay up high and walk across the nearby ductwork to this book.

 Shiv #12 – After lifting Ellie through an opening so she can open the door, you will come to a hallway. Instead of taking the left, turn right and you’ll see the door in front of you.

Watch full Grounded mode difficulty walkthrough with collectibles

Select a Chapter/Guide

Chapter  2 – Quarantine Zone (note, there are none in Chapter 1)
Chapter 3 – The Outskirts
Chapter 4 – Bill’s Town
Chapter 5 – Pittsburgh
Chapter 6 – The Suburbs
Chapter 7 – Tommy’s Dam
Chapter 8 – The University
Chapter 9 – Lakeside Resort
Chapter 10 – Bus Depot
Chapter 11 & 12 – Firefly Lab and Jackson

All 37 Optional Conversations
All 5 Ellie Joke Conversations
Toolbox Locations
Shiv Doors