Four made-up companies, four live prices. Type a ticker (ROBO, PIZZ…) to buy — each buy puts 250 of your money in. Type the same ticker again to sell. Nothing runs away and nothing has to be typed: the only question is WHEN. Read the news under the charts — a headline comes a few seconds before the price moves. After a jump, part of it often slips back, so don’t hold forever. Every trade costs a small fee, so buying and selling nonstop loses money. At the closing bell everything you hold is sold, and your score is the profit. Tickers are always in Latin letters — on any keyboard layout the key with that letter works. Trading day: 3 minutes. Crash: 90 seconds, bigger swings, and in the middle the whole market falls.