Think you are good at trading stocks? Here’s a good Friday afternoon time waster for those of you who prefer more grown-up games than you can find on Mytopia.

Test your trading skills at Inspectd. The site, which has been around for a while, shows you a historical stock chart with nothing more than the price and the moving average. You are given $100,000 in fake money and you have to decide whether to buy, skip, or sell based on nothing other than the price. Once you decide, it tells you the name of the stock, what it actually did over the next 20 days, and adjusts your account accordingly.

It is pretty addictive, and cheaper than day trading with real money.