The floor is full of puzzles and difficult to find secrets to locate rat keys which can be used to progress through the floor, the floor contains a few too many things to note but a significant part is the 5 gate hallway behind the shop, each gate needing rat keys to open. The Old West is the final floor offered by Expand the Gungeon and requires a Gnawed Key to enter it via The Hollow, making it an alternative to both the R&G dept. The boss of this area is the Interdimensional Horror but renamed to the Parasitic Abomination, after defeating said boss there is a room with a guaranteed black chest, and the exit to the area. You place the wooden crest(found in the jungle) on an altar similar to the entrance to the Abbey. The Belly is an alternate floor to The Abbey of the True Gun, and its entrance is also very similar. The Belly is the second of the custom floors you encounter in Expand. The Boss for the jungle is the The Last Human, from the Robot's past. In the jungle there is a crest room, similar to the one in The Oubliette, which is used to access another one of expands floors, Belly of The Beast. The jungle itself does not have any new enemies, but it does use enemies from the R&G Dept. The tree can only be opened using fire, you can either use an Item or Gun that shoots fire, or you can use the oil barrel and explosive barrel found within the room to set the tree on fire. Behind the locked doors is a large tree, which is the entrance to the jungle. The entrance to The Jungle appears on the first floor in a room with Arrowkin and two locked doors. The jungle is an alternate floor to The Oubliette.

The Jungle is the first of the custom floors that you will encounter in Expand. Expand the Gungeon currently adds 3 custom floors, each with unique qualities and tilesets.

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