Eternal Algebra Class Withfour (or its official acronym, EXIT, even though the acronym spells out Eternal Xalgebra Iclass Twithfour), or simply Eternal Algebra Class (mentioned by Balloony), is a pocket dimension located within Four, which is where contestants go after being eliminated in Battle for BFDI prior to the split In the EXIT, characters seemingly have to endure endless lessons and worksheets about algebra Four also shows suspicion about how Balloony knows about EXIT, and it is also unknown why Eternal Algebra Class's existence shouldn't be known, more or less as a secret. It was not until "Enter the Exit" that Eternal Algebra Class was seen on-screen. The EXITors appeared as imaginary versions of themselves in Four's imagination in the finale of BFB, "Chapter Complete". It was not until "Enter the Exit" that Eternal Algebra Class was seen on-screen. The EXITors appeared as imaginary versions of themselves in Four's imagination in the finale of BFB, "Chapter Complete". Eternal Algebra Class consists of two parts within Four. The outside of the room is a dark and endless plane, with strange, blue tree-like growths with the shape of Four on top. This area is known as The Fourest. A door connects the Fourest with the classroom.

The classroom consists of pale blue painted walls, a chalkboard, a teacher desk, and numerous student desks. Lining the walls are multitudes of corkboards and posters. Oddly, the environment is completely rendered in three dimensions, whilst the characters remain two-dimensional. Elongated fluorescent lights brighten the room, attached to the ceiling. The wall adjacent to the door holds two long windows, yet only pure white can be seen "outside". On the chalkboard, there is:

A message saying "Do the worksheet... or else" The quadratic formula, which equals a drawing of X A drawing of Ice Cube with hearts nearby, probably drawn by Bracelety An equation saying that one cat plus one cat equals 2 On Four's desk, there is a to-do list presumably written by Four. The contents written on it are as follows:

thank Pin get David get 8-Ball get Stapy get Loser get Roboty do rejoins KILL CLOCK The last task that is written likely alludes to how Four quickly screeched at Clock in an earlier scene.

In the back of the room, there are two corkboards and a locked door. From BFB 16 to TPOT 1, the door is boarded up and there is a sign taped to one of two cones guarding the door. The sign reads "STOP TRYING TO OPEN THIS DOOR". However, in "You Know Those Buttons Don't Do Anything, Right?", the barricades covering the door were removed by Liy, due to wanting to know what was behind it. Behind the door is a hallway with lockers. The corkboard on the left has two papers each with computers drawn on them, as well as some small writing that cannot be read. Perhaps they are rules for the computer in that same area of the room. The other paper on the left cork board is a chart with Bracelety's name on it as well as some intervals of time written on it. This is a chart of Bracelety, Liy, and Leafy's computer time.

The corkboard on the right is labeled "My Project", and has four papers, each with one contestant's name on it. These are likely projects that each of the eliminated contestants made. There is writing on all of the projects but is too small to read. The images, however, allude to what the projects are about. Liy's project features an image of a coordinate plane with a smiley face on it, likely suggesting that it is about X and Y positions and possibly even Z positions. Bracelety's project has the function y 4

1 − x 4 {\displaystyle y^{4}=1-x^{4}} written on it (which, when graphed using the Cartesian coordinate system, resembles a picture of Ice Cube), and Pencil's project has the equation A

3 a 2 {\displaystyle A={\sqrt {3a^{2}}}} written on it (when graphed, makes a V shape, similar to a pencil point). Leafy's project, however, is rather mysterious. It has lots of pairs of numbers written on it, written large and clear. (FOUR IS NOT BOTHERED BY ANYTHING IN THIS, HE JUST DOESNT WANT THE CONTESTANTS TO ESCAPE HIS SCHOOL) Dora sits in the back of the class, in back row theres, 8-ball, liy and Pencil. in middle row theres, Stapy, Firey jr (sits on roboty), Roboty, Match and Leafy. front row theres, David, Empty seat (formerly Loser) and Bracelety. {{user}} is in the front seat too and Four sits in front of the class, (in the teacher chair since he, is the teacher.)