Skip to main content
MARGIN CALLv0.63.2
Free · No account · Runs in your browser

Most trading games move prices at random. This one simulates the economy that moves them.

Rates rise, so leveraged companies pay more to service debt, so earnings fall, so the price falls. That chain is modelled end to end, which is why the lessons transfer.

Sectors
12
Asset classes
7
Accounts required
0

What is actually simulated

The macro economy

GDP, inflation via the Phillips Curve, unemployment via Okun’s Law, and the Fed rate via the Taylor Rule. Each one feeds the next.

Company fundamentals

Quarterly earnings, debt service, and Merton distance-to-default, so bankruptcies happen for reasons you can see coming.

Volatility that clusters

GARCH(1,1) with a shared factor model. Quiet weeks stay quiet; correlations converge on 1 when the VIX passes 40.

Options priced properly

Black–Scholes with live Greeks and an implied-vol surface that crushes about 30% the morning after earnings.

Politics with consequences

Elections, legislation and lobbying apply real sector modifiers. A bill at floor vote is priced before it passes.

Rivals that read the cycle

Value, momentum, day-trading and raider strategies that react to volatility and the economy, not to you.

Questions people actually ask

Is it free?

Entirely. No account, no download, no payment, no ads.

Do you keep my data?

Your entire game lives in your browser. There is no account to leak, and clearing site data deletes the save permanently.

Will it teach me real trading?

It teaches the concepts: reading a chain, sizing a position, what a rate decision does to a sector. It is not advice, and it is not connected to real prices.

Does it work on a phone?

Yes, a separate touch interface, not a squeezed desktop. Any modern browser.

Is it multiplayer?

Single-player against five to ten AI rivals, depending on difficulty, plus an optional daily-challenge board.

What you can trade

Stocks · Options · Corporate bonds · Crypto · Forex · Prediction markets · Real estate

Plus founding a company, taking it public, running a hedge fund, and playing across generations.

What it runs on

Any current browser on desktop, tablet or phone. Nothing to install, nothing to sign into.

Where your save lives

In your browser, in IndexedDB. It never reaches a server, which also means clearing site data deletes it for good.

Report a bug

Report a bug
Not financial advice

Every company, price and data point is invented. Simulated results say nothing about real markets.

Release notes

Last updated 11 September 2026
v0.63.2
Current

Your hedge fund seed is your money again. Launching a fund takes a share of your cash as your own stake in it, and that money was then counted nowhere at all. It left your balance and did not appear in your net worth, so seeding a fund looked exactly like losing every penny of the seed. One launch of a large fund could read as a ninety percent loss you had not made, and there is no way to close a fund, so it stayed that way. Your stake is now held as units in the fund, priced the same way an outside investor’s is, so it rises and falls with the fund instead of disappearing. Existing games are repaired when you load them and the missing money comes straight back.

The advisor stops repeating itself. The advisor re-sent its welcome message every single day, and because the panel only holds twenty messages, that slowly pushed out the things worth reading — margin warnings, and tips about what your portfolio is actually doing. A month into a run the panel could be almost nothing but identical welcomes. It now sends the welcome once, and the space belongs to real messages again.

The fund page shows your fund, not the entry requirements. After launching, the fund page still displayed the checklist for launching one, marked unmet — which was doubly odd because the two failing items were caused by the launch itself. A running fund now shows what it should: the current value of your own stake, the outside capital you are answerable for, and whether you are above the high water mark that decides if you earn a performance fee.

v0.63.1A waiting order stopped dragging its own stock down, and a part-filled order stopped counting twice.September 2026
v0.63.0Trailing stops fire, the trade screen keeps the stock you were on, the order book sits still, and the economy stopped pinning itself to its limits.September 2026
v0.62.0The chart showed the right company, trailing orders became findable, and all eight ticker colours appeared.September 2026
v0.61.0Runs stopped ending while you still had money, saved runs survived a reload, and every skill became earnable.August 2026
v0.60.0Hedge funds, the real order book on the trading screen, and one-click screens.August 2026
v0.54.0Pausing holds what is on screen, the bell only interrupts when something happened, and starting cash is yours to choose.August 2026
v0.53.0Ordinary buying stopped drawing an investigation, lawyers became hireable, and every screen scrolls.August 2026
v0.52.0News that lands once and in full, rival desks that short, and save export back on the account page.August 2026
v0.51.0Earnings reach the price, and every company reports on schedule.August 2026
v0.50.0Short selling on desktop and phone, with the real borrow rate and margin shown before you commit.August 2026
v0.49.0End-of-day recap, rival desks in the news, and WHY IT MOVED on every stock.August 2026
v0.45.0Honest price attribution, the SEC and trade-history fixes, and release notes that publish themselves.August 2026
v0.44.0Crowd flow, fund-like rivals, whale block trades, and the card-is-the-setup homepage.August 2026
v0.43.0Stationary price model, live order book, plain-language simple mode by default.July 2026
v0.38.0Simple treatment extended across every reachable table, panel and quote view.June 2026
v0.32.0Chapters removed. The narrative beats interrupted the market rather than commenting on it.June 2026
v0.27.0Simple mode became the default and the daily challenges were retired.June 2026
v0.20.0Annual review set-piece, realised P&L on stock trades, and the realised-trades panel.June 2026
v0.19.0The Floor Amber redesign was reverted to the green-phosphor CRT terminal.June 2026
v0.8.0Command palette, named AI rivals, additional themes and save export.May 2026
v0.5.0Economy rebalanced: faster mean reversion, wider credit spreads, more bankruptcies in distress.March 2026
v0.1.0First release: 108 companies, the macro economy, the price model and founder mode.March 2026