Last Updated: August 2026 | Shop prices and codes checked against the live game.
Muscle Transform Simulator starts you as a beginner at a gym machine. You train for strength and watch your muscles grow while you do it. Every character you unlock is stronger than the last, and finishing one is what lets you rebirth into the next.
It has passed 90 million visits in under a year, and almost everything in it comes down to how fast you train. This page covers the loop, all 11 gamepasses with their prices, the codes that work, and two passes in the shop that do not say what they do.
Muscle Transform Simulator Overview
| Muscle Transform Simulator Overview |
| Game Name |
Muscle Transform Simulator |
| Type |
Training and strength simulator |
| Genre |
Simulation / Incremental |
| Developer |
Castaway Studios RBLX |
| Goal |
Train, max out each character, rebirth and start the next |
| Players Per Server |
10 |
| Currencies |
Gold, plus spins and potions |
| Codes |
Yes. 5 working this month |
| Gamepasses |
11 total, all on sale, 49 to 799 Robux |
| Badges |
1 |
| Visits |
Over 90 million |
| Rating |
About 95 percent of votes are likes |
| Release |
September 2025 |
| Last Update |
June 2026 |
How to Play Muscle Transform Simulator
Nothing is locked behind a level here. You start weak, and everything after that is training time.
- Redeem the codes first. Five work right now and they hand you spins and potions for nothing.
- Train at the machines. This is where strength comes from, and your muscles grow as you go.
- Spend gold on upgrades so each rep is worth more than the last one.
- Collect pets. They raise your training speed, which lifts everything else with it.
- Max out your character completely. Finishing one is what unlocks the rebirth.
- Rebirth into a stronger character and move to a world built for it.
Muscle Transform Simulator Gameplay: Why Rebirth Works Differently Here
In most simulators you rebirth when you hit a number. In this one you rebirth when you have finished a character, which means maxing it out rather than just getting rich. That makes each rebirth a goal you can see coming instead of a wall of zeroes.
It also means the game gets harder in steps rather than smoothly. Every new character is stronger than the one before, and every new world expects that strength before it pays you properly.
Every Gamepass and What It Costs
All 11 passes are on sale, running from 49 Robux up to 799. None of them have been retired.
| Gamepass |
Price |
What it does |
| Alien |
799 R$ |
The priciest pass. Described only as an OP character. |
| Galaxy Weights |
499 R$ |
No description at all. The listing is a row of hash marks. |
| Super Luck |
499 R$ |
Plus 200 percent luck, and it stacks with the cheaper luck pass. |
| 2x Gold |
399 R$ |
Doubles the gold you earn. |
| Super Rage |
349 R$ |
Rage builds faster and lasts longer. |
| VIP |
299 R$ |
More gold, better training and a VIP character. |
| Super Strength |
249 R$ |
Also has no description. Another row of hash marks. |
| Super Train |
199 R$ |
More training points for every rep. |
| Luck |
159 R$ |
Plus 50 percent luck. Stacks with Super Luck. |
| Super Auto Clicker |
99 R$ |
Doubles your training clicks. |
| Tripple Hatch |
49 R$ |
The cheapest pass, for hatching pets three at a time. |
Two of these are worth pausing on. Galaxy Weights at 499 Robux and Super Strength at 249 both have a row of hash marks where the description should be, so the shop tells you nothing about what either one gives you.
The luck passes are the opposite, and they are clear about it. Luck adds 50 percent and Super Luck adds 200 percent, and both say they stack. Buying the pair is plus 250 percent for 658 Robux.
Codes
This game does have working codes, and the developer says so on the game page itself. They pay in spins and potions rather than gold. Our Muscle Transform Simulator Codes page lists the five that work and the one that lists disagree about.
Who Makes Muscle Transform Simulator
It comes from a verified group called Castaway Studios RBLX, which has more than 1.8 million members. The game opened in September 2025 and reached 90 million visits in under a year.
Players rate it well. About 95 in every 100 votes are likes, which is high for a simulator. The game keeps only one badge though, a welcome badge handed out for joining, so there is no milestone list to work through.
Tips for New Muscle Transform Simulator Players
- Redeem the codes before you start grinding. Five of them work and they hand out spins and potions for free.
- Use a gold potion early. Gold is what pays for upgrades, so it compounds faster the sooner you spend it.
- Get pets as soon as you can. They raise your training speed, which affects everything after.
- Finish a character before you rebirth. Rebirthing is tied to completing them, not to a timer.
- Do not buy the two passes with no description without asking someone first. A 499 Robux pass that does not say what it does is worth a question in chat.
- If you want luck, remember the two luck passes stack. Together they are plus 250 percent for 658 Robux.
- Train at machines rather than wandering. The machines are where strength actually comes from.
- Move worlds when the challenges stop paying. Each world is built for a stronger character than the last.
Muscle Transform Simulator FAQ
How do you rebirth in Muscle Transform Simulator?
By completing a character rather than by hitting a number. Max one out and the rebirth opens up.
Does it have codes?
Yes. Five work this month and they give spins and potions. The game itself points players at its socials to find them.
What do pets do?
They boost your training speed, which makes every other upgrade worth more.
What is the most expensive gamepass?
Alien at 799 Robux, described only as an OP character. The cheapest is Tripple Hatch at 49.
Do the luck passes stack?
Yes, both say so. Luck is plus 50 percent and Super Luck is plus 200 percent, so the pair is plus 250 percent.
Why do two passes have no description?
Galaxy Weights and Super Strength both show hash marks instead of text in the shop. Worth asking about before spending on either.
How many badges does it have?
One, for joining. There is no milestone ladder to chase in this game.
How many players are in a server?
Up to 10, so it is a quiet game compared to most simulators.