

Meco Rocket Simulator is a realistic physics game where you play as an underpaid rocket scientist working for Mecodyne to design and test rocket engines without regard for your safety.
Overview
Meco Rocket Simulator is a realistic physics game where you play as an underpaid rocket scientist working for Mecodyne to design and test rocket engines without regard for your safety.
Description
Turbopumps. Gas Generators. Injectors.
Every component to build a cryogenic GG-cycle engine is taught.
Design. Test. Fail. Learn.
After 5 years in development, this game is still in Early Access. Many of the features below are still in development and not yet available. Please see the Early Access notes above.
The above can take between 1 and 3 years to complete. If enough people like you buy this, I can focus on this 100% as my full-time job, and development will be much quicker. Your support is very much appreciated!
Dannie Sim
Solo Indie Dev – Meco Rocket Simulator
(formerly at Activision/Blizzard on Candy Crush & Sony PlayStation on Spider-Man 2)
After 5 years in development, this game is still in Early Access. Many of the features below are still in development and not yet available. Please see the Early Access notes above.
Features Roadmap:
The above can take between 1 and 3 years to complete. If enough people like you buy this, I can focus on this 100% as my full-time job, and development will be much quicker. Your support is very much appreciated!
Dannie Sim
Solo Indie Dev – Meco Rocket Simulator
(formerly at Activision/Blizzard on Candy Crush & Sony PlayStation on Spider-Man 2)
A realistic rocket engine sim where every failed test teaches you something real.
You're an underpaid engineer at Mecodyne — the kind of propulsion company that ships rockets aggressively and has opinions about your eyebrows. On your first day you accidentally fire up a Vulcain 1 on your coworker's workstation. The graphs come alive. The Vulcain runs. You probably shouldn't be doing this.
From there, you design real rocket engines — cold-gas thrusters, gas generators, full pump-fed turbopump beasts — using actual physics. Combustion. Fluid dynamics. Heat transfer. Component-level engineering. Twist an injector orifice and the chamber pressure curve responds in real time. Tighten the cooling channels and watch the thermal margin shrink. Reshape the nozzle and see what it does to Isp.
It's a sim that won't lie to you. If your design wouldn't work in real life, it won't work here either.
Missions (start here)
Thirteen guided challenges, from "what's a model?" to gas-generator turbopump engines inspired by Merlin 1D, F-1, and Vulcain 1. Senior engineer Miku Aoyama walks you through — deadpan, accurate, mostly patient. No prior knowledge needed — Mission 0 starts you with that accidental engine fire-up on her workstation.
Free build
Skip the missions. Empty canvas, node-based editor, live graphs. Drop in components, wire them up, hit run, see what happens. Good for "what if I just…" experiments.
Recreate real engines
Same components, same physics. Build a Merlin 1D from scratch. Or an F-1. Or something that's never existed and probably shouldn't. Push materials, propellants, and geometry until something gives.
Soundtrack, technical reference PDFs, 3D-printable component models (STL/3MF), and high-resolution wallpapers. For the people who want the lore in their toolbox.
This isn't a casual arcade game. It's a serious engineering sim with a real learning curve, and honestly, your first dozen designs will probably fail in interesting ways. That's the point. The failures are where the learning happens — graphs go red, you stare at them, you figure out which assumption was wrong, you try again. By mission five you'll be reading turbopump curves like they're tech manuals.
If you've spent time curious about what actually goes on inside a running rocket engine — and why a 5% change in injector geometry can ruin your whole afternoon — Meco was built for you.
Come build something that works. Or something whose graphs go red in fascinating new ways. Both are fine outcomes.
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Update 0.5 - Complete Gas Generator Cycle, Missions 10-12
The most realistic rocket engine simulator
Update 0.4 - Turbopumps are in, Missions 7-9
Update 0.3 is here - Missions 4-6, better schematics
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