The price of a stock depends on random factors and an underlying trend. A good trader will be able to discern the underlying trend and use the instinct to buy or sell the stock and make a profit.
This game simulates the price movement and allow the player to discern the underlying trend. This skill has to be developed through regular practice.
It is hoped that the a player, who is able to show a trading win on this app will be able to replicate it in real life.
All the best.