Note: This procedure requires editing a game file; creating a backup copy of the file before proceeding is recommended. With a text editor, edit the "sonic.ini" file in the "windows" directory. Add the following line to the file:
Start up the game and two new menus will appear. The "Stage" menu will allow any stage (including Special Stage 8) to be selected. The "FUNC" menu has the ability to turn on debug mode, turn off the special stage timer, record and play a demo, and uncheck the MMTimer option to place the game in turbo mode.
Press DOWN, DOWN, DOWN, LEFT, RIGHT, SPACE at the title screen to enable the sound test screen and chat mode. Enter and play one of the corresponding sound combinations to activate the corresponding cheat:
CHEAT FUNCTION - SOUND COMBINATION Debug mode - PCM12, DA11 Bonus levels - PCM07, DA07 Display artwork - PCM03, DA01 Human-faced Sonic - PCM12, DA25 Hercules Sonic - PCM04, DA21 "Revenge of the Mutant Artwork" - PCM11, DA09
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
ACHIEVEMENT - HOW TO UNLOCK 88 Miles Per Hour - Travel through time All Stages Clear! - Finish the game Dr. Eggman Got Served - Destroy Dr. Eggman's final machine Heavy Metal - Defeat Metal Sonic without getting hurt Just in Time! - Complete the Time Attack mode in under 25 minutes Just one hug is enough - Get a hug from Amy King of the Rings - Collect 200 Rings Paradise Found - Complete a zone in the Good Future Saviour of the Planet - Destroy all the robot teleporters and Metal Sonic holograms in the past Statue Saviour - Find the angel statue in Wacky Workbench Take the High Road - Pass the upper Signpost in Collision Chaos Zone 2 Treasure Hunter - Collect all the Time Stones