Backrooms Supps adds compatability between Meulti's Backrooms, Faithful Backrooms, and adds firesalt and a firesalt gearset. A more comprehensive guide can be found on the wiki.
The Portal Block and a corrisponding base can be used to move between different backrooms levels:
Portal Bases can be built to control which level the gateway will open to.
Most of the blocks and items from Faithful Backrooms and Meulti's Backrooms have been given crafting recipes. JEI is reccomended for keeping track of everything.
The Reinforced Hazmat Suit from Meulti's Backrooms has been given a recipe. Combining the regular hazmat suit with copper (or the copper armor of the Copper Age Backport), will yield an armored version of the Hazmat Suit, that provides a bit of extra protection.
Walkthrough Showcase:
