Sonic the Hedgehog

Getting started: Press Enter to start the game. You control Sonic through Green Hill Zone, which looks and plays slightly differently from the final version. The core objective is the same: collect rings, avoid or defeat enemies (mostly by jumping on them), and reach the end of each act within the time limit. Do not let the timer hit zero, or you lose a life. The prototype has different level layouts, so be prepared for unexpected pits, altered enemy positions, and missing obstacles. There is no save feature - like most Genesis games of this era, you must finish in one sitting or use passwords if available (this build may not have working passwords). Experiment with the spin dash move (hold down and press the jump button) once you master the basics; it was a new technique at the time and is fully functional in this build.