The market names a price. You decide the value≠ price.
MARGIN is a value-investing simulator. Read a company's filings, work out what it's worth, and buy only when the price gives you a margin of safety. Then survive Mr. Market's manias and panics —quarter after quarter, for years.
Price vs. intrinsic valueIntrinsic valueMr. Market (price)Margin of safety
It isn't trading. It's analysis.
No candlestick charts, no blinking red buttons. You are a fund analyst: annual reports, income statements and balance sheets land on your desk, and your job is to understand the business before you risk a single euro.
Price is what you pay; value is what you get. When the two diverge far enough —and only then— you buy. The rest of the time, you wait. Patience is a skill you practise, just like valuation.
Four decisions, over and over.
1
Read the business
Open the filing: revenue, debt, owner earnings, footnotes. The signal lives in the fine print.
2
Put a price on it
Estimate intrinsic value on the worksheet. Project, discount, and be honest about your assumptions.
3
Demand a margin of safety
Buy only at a discount to your value. The margin isn't optional —it's what protects you when you're wrong.
4
Survive Mr. Market
Quarters advance. Manias, panics and frauds arrive. Size your position and hold your thesis —or correct it.
It rewards process, not luck.
Most stock-market games reward the lucky moonshot. MARGIN tells you whether you were right by judgment or by luck —and proves it.
A typical stock game
Rewards the lucky moonshot
A leaderboard to game
Luck counts as skill
You win or lose, never knowing why
With MARGIN
Skill vs. luck. Every run computes your Skill Score and re-simulates alternate futures: did you win on process, or catch a good streak?
No leaderboard, no prizes. Nothing to game. The only score that matters is the quality of your decisions, graded against a rubric.
A real curriculum. Bilingual (EN/ES) cases that actually teach: price vs. value, owner earnings, moats, and behavioural bias.
Deterministic & replayable. Every world grows from a seed. Share yours, replay the exact game, and compare your judgment with someone else's.
MARGIN · score cardSkill Score
78Process
12Outcome
you won on process, not luck
a sample of what you see when a game ends
Learn by reading real (simulated) businesses.
Chapter 1 Price vs. valueplayable now
Chapter 2 Reading the statementsplayable now
Chapter 3 Moatsplayable now
Chapter 4 Traps & fraudsplayable now
Chapter 5 Cycles & temperamentplayable now
Chapter 6 Portfolioplayable now
Chapter 7 Behavioural biasplayable now
Ready to think like a value investor?
Enter the private beta, start with Chapter 1, and buy your first business with a margin of safety.
MARGIN is an educational simulation. It is not financial advice or an investment recommendation. The companies, prices and financial statements are fictional and generated deterministically.