Activate the following cheats by entering the corresponding codes in the Sound Test:

CHEAT FUNCTION - CHEAT CODE
"Batman" Sonic - PCM 04 DA 21
Cute Sonic - PCM 11 DA 09
Dj Mc Sonic - PCM 03 DA 01
Secret Special Stage - PCM 7 DA 7
Tails - See you Next Game - PCM 12 DA 11
That Freaky Sonic One - PCM 12 DA 25

Complete the game as Sonic to unlock Tails.

To see the best times of the game developers, press the following at the title screen: RIGHT(2), UP(2), DOWN, C.

At the title screen, press the following to unlock the option of selecting any stage: UP, DOWN(2), LEFT, RIGHT, B.

Unlock the following bonuses by performing the corresponding tasks in Time Trials:

BONUS - HOW TO UNLOCK
D.A. Garden - Have a total time less than 37'00 in Time Trials
Sound Test - Have a total time less than 4'00 in Special Stage Time Trials
Special Stage Time Trials - Have a total time less than 30'00 in Time Trials
Stage Select - Have a total time less than 5'00 in Special Stage Time Trials
Visual Mode - Have a total time less than 25'00 in Time Trials