Start with $10,000 in play cash and a 60-second clock. Tap a stock card to open the trade panel, set a quantity, and Buy or Sell.
Prices move on their own every 1.5 seconds while the round is running — each stock has its own volatility, so some (like NVDA) swing harder than others (like SPY).
Your Portfolio panel tracks what you're holding, its current value, and your paper profit/loss on each position in real time.
When the clock hits 0, everything you're still holding is automatically sold at the current price and added to your cash — that final total is your score.
Your Leaderboard shows your own best scores from past rounds on this device.