You don't know how to play the classic Sega arcade game Sonic the Hedgehog? Er, ok... run quickly, jump on things, collect rings, run even more quickly, avoid dying (except you can't die in this version, so that's a big help). Ok? If the game runs slowly on your machine, use the Quality option in the game window to reduce the graphics quality. This is more like a demo game, as it has only one level and there are a few minor "bugs" in it (I didn't write it by the way), but it is still fun if you're a true Sonic the Hedgehog fan like me. For example, it is possible to run off the edges of Sonic's world, but I don't recommend doing that. Also, the Website and Help options don't work, and Help sometimes causes a potentially annoying pop-up advert window to appear, so it's best not to use them.