The Stock Market Game introduces students in grades 4-12 to the real-world of investment. See your teacher for your log in information. Good luck investing!
Here is an alternate site that offers a fantasy stock market game that simulates trading stocks and options for those not signed up for the Stock Market Game.
Another stock market simulation site is from the Wall Street Survivor. Their mission is to spread financial literacy by showing students how simple and fun it can be to buy and trade stocks.