User blog comment:Ouroburos.TheNewSaurian/Sonic Adventure 3: New Information/@comment-72.192.41.130-20130328234034/@comment-4743273-20130329044904

Indeed it is. Essentially, every game on this site is a fan game. It's a creative fanon site devoted to allowing people to showcase their ideas for games they'd like to see, but that haven't been made yet. :)