In Oxenfree 2: Lost Signals, players can discover a set of 13 Adler letters, buried by the protagonist's partner Jacob during his childhood. Uncovering all 13 letters will unlock achievements such as "A Flash of Green," "Peace in this Ocean," "Among the Headstones," "Orphaned Dreams," and "One Last Mystery."
Each letter provides insight into Adler and the game's surroundings. Upon finding the final letter, an exclusive conversation initiates between Jacob and Riley. To locate these collectibles, players must search for small blinking lights found throughout various regions of Oxenfree 2 and interact with them by pressing the designated button. It's important to note that these lights only appear after obtaining climbing equipment from the general store, and a few may require additional conditions to be met.
Uptown Harbor
Players can find the first Adler letter immediately after getting the climbing equipment. Go up the hill behind the general store and check behind the flagpole.
Highway by Funnie's
This particular location is known by different names such as Funnie's, the Highway, or the Parking Lot, depending on what the players refer to it as. However, to get to this area, one must simply follow the designated automobile road leading out of Uptown Harbor. As for the Adler letter mentioned, it can be found conveniently situated right below the dumpster.
Copper Creek Trail
Take the upper exit from either Funnie's or Uptown Harbor to access Copper Creek Trail, where players will encounter Jacob. Ascend the rock wall while progressing towards the Pemmican Trailhead to discover an Adler letter. Alternatively, players can depart from Pemmican by utilizing the southeast exit to acquire this letter.
Pemmican Trailhead
Take the northwest exit from Copper Creek Trail to spot this letter. It's across a fallen log near the entrance that otherwise leads to a dead end.
Camber Cape
Players have no reason to return to Camber Cape after getting the climbing equipment, but those who do will find an Adler letter in front of the animal den near the summit.
Waterhead Bluffs
In the climbing sequence, instead of following Riley, players should climb up to the ledge and jump to the right. This new route takes them to a trail where they can find an Adler letter.
Charity Point
As players ascend the Waterhead Bluffs, instead of going left towards the bridges, they should jump across to a nearby platform on the right. Here, they will discover an Adler letter lying on the ground.
Point Tilia
First Letter
Second Letter
In contrast to all other regions in the game, Point Tilia presents an exceptional feature consisting of not one, but two Adler letters that can be acquired by players. In order to obtain the complete sequence, it is imperative to finalize the task alongside Charlie in this particular area. Once accomplished, proceed towards the left side, passing the picturesque waterfall. Ascend towards the vantage point, and subsequently, follow the trail to your left before descending down a rock wall to retrieve the initial Adler letter.
To find the second Adler letter, head towards the ranger station and take a right onto a faint trail. Follow this trail until you come across a log that you can climb onto. From there, you'll be able to access the secluded area where the Adler letter is located.
Horseshoe Beach
This Adler letter can only be found after players have positioned the transmitter in Tootega Falls. Rather than immediately returning to Point Tilia, venture towards the beach located to the right of the natural bridge and proceed towards the water's edge on the right side.
Tootega Falls
This Adler letter also won't appear until after the story in this region is complete. It shows up on one of the stones at the base of the falls.
Garland
The last regular Adler letter is in the ghost town of Garland. Head up the stairs behind the cemetery to reach it.
Berenson Creek
Players need to gather all 12 letters before they can access the thirteenth and final Adler letter. These other letters can be collected in any order, but the one in Berenson Creek is consistently the last one. To find it, players must descend the stairs in front of Jacob's cabin and locate his shack. The letter can be found just beneath the metal sunflower sculpture.
Oxenfree 2: Lost Signals is available now on Android, iOS, PC, PS4, PS5, and Switch.