Luckily, there is a way to fix every problem without downloading anything (though you may need to install the controller drivers if you haven't used it yet). It is very similar to the launcher from NiGHTS Into Dreams., except that if you launch Sonic Adventure 2 from Steam, you have to configure the game every time.
The problem is actually the launcher this game comes with. Well, what if your controller actually does work? Actually, the problem may not be your controller. A lot of people are forced to use a keyboard because they may not know how to set up a controller. Sonic Adventure 2 is a really weird game with controllers.
