You will start fully invested in the market, with $100,000 (when you push the "Start/Pause" button). You can sell all of your investments by pushing the "Sell" button and buy back in by pushing the "Buy" button. At the beginning, you can only sell. Once you've sold, you can then only buy. See if you can outperform the market by selling high and buying low. The game will last for about 3 years (750 market days), after which you can extend the game or restart with another random, historical period.