Master System II version

The Sonic The Hedgehog version that came built-in the Master System II console lacks credits. Because ROM chips were very expensive at the time, the credits were dropped to make room on the small ROM chip for the necessary BIOS routines for the console. By doing this, Sega avoided having to buy bigger and more expensive ROM chips for the console.

Contributed by ケヴィン (4082) on Dec 12, 2011. -- edit trivia