The game contains an extensive list of features, including 4 playable characters: Sonic, Tails, Knuckles, and Cream, with 2 more to unlock. Complete each level by running to the end point and avoid the enemies and the objects which they throw. There are two modes of play, Main Game and Time Trial. The author has even included a password mechanism and a cheat code facility. Everything about this game is polished, right down to the initial selection menus with music and sound effect volume sliders....and there is no way you cannot NOT play this game.
But all credit does go to the original creators of Sonic at SEGA.