Last Updated: September 2026 | All 70 shop prices read off the live game, and the pass and badge counts checked against it.
Build Your Backrooms flips the usual haunted maze around. You are not the one lost in it. You build the maze, you buy monsters and put them inside, and other players walk in and get caught. That is how you get paid, and it keeps happening while you are logged off.
The game’s page tells you that much and stops. It does not tell you that monsters cost far more than rooms, that the thing really holding you back is how many monsters you can field at once, or that the studio charges double for the second batch of slots. All of that is in the shop, and all of it is below.
| Genre |
Maze building and tycoon |
| Studio |
Wind Sun Moon |
| Released |
22 June 2026 |
| Players per server |
6 |
| Monsters you can buy |
13, from 9 to 399 Robux |
| Rooms you can buy |
39, from 3 to 89 Robux |
| Game passes |
Five |
| Badges |
None |
| Codes |
None, and no code box in the game |
| Private servers |
Not available |
How to Play Build Your Backrooms
- Start with the plot you are given. Six people share a server and everyone gets one.
- Buy a room and place it. The cheapest corridor is 3 Robux and the game gives you some money to begin with.
- Join your rooms into a maze. Corridors, turns, junctions and crossroads all connect differently.
- Put a monster in it. That is what catches people, and catching people is what pays.
- Walk into somebody else’s maze to see how they built theirs. That is half the game.
- Leave. Your monsters keep catching people while you are logged off, so the money keeps coming in.
Build Your Backrooms Overview: Monsters Cost Far More Than Rooms
The shop sells two different things: rooms to build the maze out of, and monsters to put in it. Line the two up and the game tells you which one it thinks matters.
| Monster |
Robux |
Notes |
| Wanderer |
9 |
The one everybody starts with |
| Smiler |
29 |
The classic backrooms face, and part of the starter bundle |
| Hound |
49 |
The black dog you see in the pictures |
| Crawler |
79 |
Mid range |
| Siren Lamp |
99 |
The first one to break three figures |
| Water Dweller |
149 |
Pairs with the pool rooms |
| Mimic |
249 |
Near the top |
| Grasper |
399 |
The dearest thing in the whole game |
There are 13 monsters, running from 9 Robux up to 399. That top one is the most expensive thing in the entire game. Now here are the rooms.
| Room |
Robux |
Notes |
| Yellow Corridor |
3 |
The cheapest room there is |
| Yellow Crossroad |
5 |
Still the starting level |
| Empty Office Room |
9 |
The next step up |
| Hotel Corridor |
32 |
A later level and it costs ten times the first |
| Old Lobby |
49 |
Getting expensive |
| Red Pool |
89 |
The dearest room in the game |
There are 39 rooms and the dearest is 89 Robux. So the priciest monster costs four and a half times the priciest room, and a hundred and thirty times the cheapest one.
What that ordering tells you
A studio prices things by how much they change the game. Rooms are the scenery here and monsters are the point, and you can see that in the numbers before you have played a single round.
The room prices are worth a second look too. The cheap ones are plain yellow corridors, the sort everybody pictures when they hear the word backrooms. The costly ones are pools, hotels, arcades and red sectors, which is the shop walking you through the deeper levels in price order.
Build Your Backrooms Gameplay: Slots Are the Real Limit
There are five permanent unlocks. Two of them are the same thing bought twice, and together they are the most expensive pair in the game.
| Unlock |
Robux |
What it is |
| +3 Monster Slots |
199 |
Added at launch |
| +3 Monster Slots (2) |
399 |
Added six weeks later. The same +3, double the price |
| 2X Cash |
199 |
Doubles what your maze earns |
| Monster Boost |
149 |
Cuts monster cooldown by a quarter |
| Starter bundle |
29 |
Cash, a Smiler and a room, for beginners |
Read the first two rows again. Both give you three more monster slots. The first is 199 Robux and the second is 399, and the second one went on sale six weeks after the first.
Exactly double, for exactly the same thing. That is the clearest sign in the game that slots are the bottleneck rather than money, and that each new batch is meant to cost more than the last.
Buy in the right order
If you are going to buy slots at all, the 199 one is the better deal by a wide margin. There is no discount for taking both and no bundle that includes them.
The other three unlocks each give something away about how the game works. One doubles your earnings. One cuts the wait after a monster makes a catch, which is how you learn there is a wait at all. The third is a 29 Robux starter bundle whose name simply lists what is in it.
The Money Keeps Coming While You Are Away
The game’s own page promises that monsters catch people even when you are offline. That is easy to say and hard to check, except the shop settles it.
There is an item for sale that triples your offline earnings, for 79 Robux. Nobody sells a multiplier on something that pays nothing, so the offline money is real and it is worth enough for the studio to charge for more of it.
That makes this a game you can leave alone. Build a decent maze, put your best monsters in it, and it will still be earning when you come back.
A Studio Building the Same Game Twice
The group behind this has published three games, and lined up they tell a clear story. The first was a worm game from April. It has 484,000 visits and last saw an update in May, and when we looked there were eight people in it.
Then came this one, which has passed 51 million visits. That is more than a hundred times the worm game, from the same small studio, ten weeks later.
And at the end of August they started a third, called Build Your SCP. Same two first words, same idea, a different set of monsters. It is small so far, but it was updated a few days ago, so it is very much being worked on.
Tips for New Build Your Backrooms Players
- Spend on monsters before rooms. The dearest monster costs four and a half times the dearest room, which tells you where the power is.
- Watch the slot count, not your cash. The two most expensive unlocks in the game are both extra monster slots, so slots are the real limit.
- The second slot pack costs double the first for the same three slots, so buy the cheaper one first if you are buying at all.
- Cheap yellow corridors are 3 Robux and connect fine, so a big maze does not have to be an expensive one.
- Monsters have a cooldown after a catch. That is why a spread of cheap monsters can beat one expensive one.
- Log off without worrying. The game is built to keep earning while you are away, and the studio sells a booster for exactly that.
Build Your Backrooms FAQ
Does Build Your Backrooms have codes?
No, and there is no code box in the game to type one into. Our codes page explains which thirteen near-name games you are probably finding instead.
What is the most expensive thing in the game?
A monster called the Grasper, at 399 Robux. That is four and a half times the dearest room and a hundred and thirty times the cheapest one.
How many monsters can I have?
You get a starting number of slots and the shop sells two lots of three more, at 199 and 399 Robux. The second lot costs double the first for the same three.
Do I earn money while I am offline?
Yes. The game’s own page says your monsters keep catching people while you are away, and the shop sells a booster that triples that offline income.
Are there any badges to collect?
None at all. The game has never had a single badge, so there is nothing to chase on the side.
About Build Your Backrooms
Build Your Backrooms is made by Wind Sun Moon, a group of about 857,000 members that is not a Roblox-verified group. The account that owns the group does not carry a verified badge either. The group describes itself as a mysterious studio making unusual games, which for once is a fair summary.
The game opened on 22 June 2026 and has passed 51.1 million visits, or roughly 609,000 a day. A server holds 6 people, and with about 2,300 playing that is at least 387 servers open at once.
Players have voted it up 496,741 times and down 9,891, so 98 in every 100 votes are positive out of more than half a million cast. That is a very large pile of votes for a game barely three months old. It has 290,530 favorites and no badges at all.