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Sonic Blast (Game Gear)
Press Up, Up, Up, Down, Down, Down, 1, 2, 1, 2, Start at the title screen.
A build date is present at 0xC0:
GG SONIC 96 Ver E3 ROM 1996/05/01 @SEGA /Aspect Co.,Ltd
All of the 8-bit Sonic titles developed by Aspect contain a generic error handler routine at ROM 70. While the other games' routines consist of some variation on "print an error message and reset", the Sonic Blast handler simply freezes the game by going into an infinite loop. Since the game doesn't call this routine and the Z80 has no hardware error trapping, this code will only execute in the extremely unlikely event that a bug coincidentally causes the game to jump directly into it.
The game's name was changed to G Sonic in Japan.