well it is a game in that it uses virtual money, and the stock prices are 15 minutes delayed.
you can choose to use real money, but I prefer trading FX on Oanda instead of playing with stocks (its US based, but you can buy/sell foreign US listed stocks and ADR's).
It is now called Kaching I think... I can send you an invite if you like.
You can only trade when the markets are open in the States. Buy course you can place orders on stock when the markets open. I personally am a speculator, so this current environment is not too good for me with most stocks experiencing positive growth :lol: