Team Fortress 2 is the most realistic hat simulator created to date. There is absolutely no other simulator quite like this one. The first time you start the simulator, you join a server where you can play a minigame where you show off your hats and items. If you kill a person three times in a row in the minigame, you get your very first hat: the Gibus. This is where it really starts; To play the simulator correctly, you have to spend money in the market place, made by Valve. After that, while you play the minigame, you can find hats which you can trade for, or collect! There is many other people who wants to collect and trade hats, just like you! After you collect enough items and/or hats, try joining a trade server! There, the REAL fun begins! Good luck, and beware of ending up poor!