Christmas Day secret:-
Set the Saturn's internal date to December 25 to witness an appearance by Santa Claus.

New Year's Day secret:-
Set the Saturn's internal date to January 1 to view a Happy New Year message. No snow will fall at 12:00 a.m. on this date.

Valentine's Day secret:-
Set the Saturn's internal date to February 14 to view Valentine hearts.

April Fool's Day secret:-
Set the Saturn's internal date to April 1 to play as Reala. An option to play as Reala will appear in the presents menu after finishing one level as her.

Time secrets:-
Set the Saturn's internal clock to a date in November through February with the following times to change the snow to the corresponding items:

9:00 a.m., for crescent moons
12:00 p.m. for small purple gems
3:00 p.m. for candy
6:00 p.m. for sparkles
9:00 p.m. for stars
12:00 a.m. for hearts

Hidden images:-
Put the game disc in a PC compatible CD-ROM drive. Look in the "EXTRAS" directory to find the images.

Fight Dr. Robotnic  -  Play the game with Sonic the Hedgehog to fight Dr. Robotnic.

Rotate the 3D level map:-
View the level model at the link data or best time screens. Press L or R to move the model. Press L + R to stop it.

Nightopian Dreams Dreams music:-
Get the Nightopian Collection option. Go to any level and get every Nightopian on the happiest setting. After this is accomplished, look at the Nightopian collection for that level. The Nightopians will sing and hum the "Dreams Dreams" music.