Here are some cheats and tips for the game Sonic the Hedgehog.
Level select:
Hold 1 + 2 + Start and continuously sweep the D-pad when Tails begins
to run in the opening sequence. The sound of a credit being added will
confirm correct code entry. Press Start to continue.
Bonus life:
After completing a level with less than 50 rings, run through the
turnstile. Stop and jump into the air. Timed correctly, the turnstile
should stop spinning while it is off the screen and display an extra
life power-up when Sonic lands.