RunTheSim
I build playable browser simulations of a different kind, so the boundary first. RunTheSim has no companies, no revenue, no win screen. What it shares with a good business sim is the one thing that makes either worth an hour of your evening: you move something, and the system answers.
What a business simulation browser game actually simulates
Take the theme away and almost every business sim is the same object. A handful of variables, a delay, and a rule that feeds the output back into the input.
The best known one in management teaching is the beer distribution game, a supply chain played by four people who cannot see each other's orders. Nobody in it is incompetent. The missing information on its own is enough to make orders swing harder and harder up the chain, which is the bullwhip effect.
That is the entire lesson, and it has nothing to do with beer. The field that formalised this way of looking at things is system dynamics, and it predates the browser by decades.
Why the feedback loop is the part that sticks
Players remember the swing. They do not remember the spreadsheet.
That is why a business sim and a plain feedback loop sit closer together than they look. In a business sim the loop is buried under prices, staff and a quarterly report, and you infer it from the damage. In a systems simulation the loop is the whole screen. Ants laying pheromone reinforce the path they already walk, which pulls in more ants, which strengthens the trail again. Same mechanism, no costume, and you can turn the decay rate down until the colony loses the map.
A business sim asks you to win. A systems sim asks you what happens if you push this one slider to a stupid number. The first one is finished the moment you beat it, and the second one keeps going as long as you keep asking, which is the only reason either of them survives a second sitting.
Business sim or systems sim: which tab to open
Both run in a browser, both are free at the entry level, and they answer different questions. The table is the honest version of the difference.
| Question | Business simulation browser game | Systems simulation |
|---|---|---|
| What you control | prices, hiring, stock, investment | rules and parameters |
| What it reports | quarterly results and a score | the pattern itself, live |
| It ends when | you win, lose or run out of turns | you close the tab |
| What you keep | a decision habit under pressure | how one mechanism behaves |
If you came looking for a business simulation browser game because you want practice under pressure, take the business sim. If you came because a system somewhere confused you and you want to see why it did that, the naked loop is the faster route. My own reading of the two formats is in interactive simulations vs explainer videos.
What to check before you give one an hour
Most browser sims lose you in the first minute, and it is usually the same four reasons.
Before you spend an hour in a browser sim
- Can you change something in the first ten seconds, without an account?
- Does the screen answer straight away, or only after you submit a turn?
- Can you push a parameter to a ridiculous value and watch it break?
- Does the page say what the model leaves out?
The last one matters most, and it is the one most business sims skip. A model that hides its own simplifications teaches you confidence instead of judgement. Every simulation here carries source notes for exactly that reason.
RunTheSim is a solo project, built in St. Gallen. Everything live right now is free to play, no account needed.
If the loop is the part you were after, skip the quarterly report and watch one run on its own: the simulation library is free and needs no login.