The Additional Dimension

You step into the spatial anomaly with a sensor array in hand, lock the device into place, and the radio goes dead. The elevator that brought you down is gone. That is the situation in The Additional Dimension, a short psychological horror adventure where a Soviet experiment in 1970 has opened a hole in reality, and you are the Associate Professor sent to look inside.

The 1970 Collider Mission Behind The Additional Dimension

The premise is simple and effective. A Soviet collider punches a hole through the fabric of reality, and three hours later you are on your way to becoming the first human to step into a new dimension. You play an Associate Professor on a routine, honorary mission: deploy a sensor array and return. The mission was arranged by your supervisor Petrov, and the game never lets you forget how badly that choice turns out.

The page sums up the pitch as the Backrooms, but Soviet. The setting gives the liminal feel something specific to hold onto, with research-base corridors and a room where calculations cover the floor and handprints mark the walls.

Commenters mention time-loop and time-travel ideas running through the story, which is told largely through notes. One said the concept felt like much more than another typical liminal-space game.

Looping Hallways and the Right Passage

The first real puzzle appears after the room with the calculations on the floor. From there you can go forward, left, or right, and the right passage is easy to miss because it stays hidden in darkness until you are close. Left and forward always loop, while the right passage leads onward. One player on a replay spent ten minutes alternating between left and right without realizing it.

That moment captures the logic of the whole game: to unravel the place, you have to read the space itself. Commenters say the puzzles are not overly difficult but are enough to make you turn around a few times, which adds to the disorientation.

Rough edges exist. One player hit a bug that restarted the run at the 34-minute mark, though they said it did not ruin the evening. Backrooms fans will forgive small slips, since the looping halls are what they came for.

Two Endings and the Notes That Lead to Them

There are two endings: either you correct the mathematical errors of the past, or you are permanently integrated into the infrastructure of the base. Players refer to them as endings A and B, and several say they finished both.

The story is delivered through notes and voiced moments, which is where the most divisive point comes up. Several commenters say there is a lot of reading, and one suggested dialing it back a little. Others say the notes make the plot easy to follow and praise the voice acting.

Players who went back for the second ending say the hints for reaching it are well placed. With a full playthrough lasting around 30 to 40 minutes, a second pass costs little, which makes completionists happy.

Liminal Horror Without Monsters in The Additional Dimension

The horror here is built on atmosphere rather than chases. Commenters note there are no monsters walking around, yet the real fear comes from not knowing what will become of you. One player counted only two jumpscares and said the game needed no more.

The visuals use a PlayStation-era look, tagged as PSX, which suits the analog dread the description promises. It is a dense, slow-burn psychological nightmare inspired by classic sci-fi, and the low-detail style makes empty corridors feel stranger.

Players who want action or frequent scares may find the pacing too patient. Story readers and fans of walking simulators will enjoy the slow unfolding more.

Questions Players Ask About The Additional Dimension

1. How long does The Additional Dimension take to finish? A full playthrough is estimated at 30 to 40 minutes, though it depends on how long you spend in the looping halls. Getting both endings roughly doubles that.
2. How do you get past the looping hallways? After the room with calculations on the floor and handprints on the wall, take the right passage. Left and forward lead into loops, and the correct way is hard to see until you get close.
3. How do you reach the second ending? Players say the hints are well placed, so replay with attention to the notes from Petrov and the base. One ending corrects the mathematical errors of the past, while the other integrates you into the base.

The Additional Dimension turns a Soviet experiment into a compact, unsettling walk through loops and notes. Petrov’s mission, the right passage after the calculations room, and the choice between two endings give the game a shape that stays with you long after the roughly half hour it takes to finish.