Complete the Hero storyline to unlock Shadow The Hedgehog, Rouge The Bat, and Cream The
Rabbit. Complete the Babylon storyline to unlock Eggman. Complete Storm's, Wave's, and
Jet's missions to unlock AiAi, Ulala, and NiGHTS.

Accumulate over fifteen hours of game play time to unlock E-10000G. Accumulate over fifty
hours of game play time to unlock E-10000R.

There is a nice shortcut that can only be used by flying characters. When you get to the
first river stream with the waterfall ahead, go past the speed and power signs. There will
be a path you can take to go forward or left. Go forward and turn left to see a booster.
Get on it and do not turn left or right. You will then see three big looking rings
(accelerators) and you will be taken to the Ferris wheel-looking object in a short amount
of time.

Before the Dark Desert race, there is an intermission sequence showing Storm holding a
chip-looking object. When everyone starts to read it, Storm will say It's about the
Babylon treasure from our ancient ancestors., but it reads It's about the Babylonian
treasure from our ancient ancestors.

Complete the indicated storyline to unlock the corresponding movie under the Theater
option:

Movie 1: Complete the Hero storyline. 

Movie 2: Complete the Babylon storyline. 

Movie 3: Complete the Final storyline.

When you see the first ramp near the end of the stage, get your jump to maximum height
without slowing down. Make sure you are going at maximum speed and hold the Analog-stick
Up. If done correctly, you will hit three spider webs and cut off part of the track.

Instead of losing speed when hitting the lava, boost through it to keep your velocity.

To use automated trails effectively, wait for the Analog-stick spinning part to begin.
When you spin it, it fills your air gauge. However if you keep spinning it beyond that,
the speed meter will go faster up to a certain point.

While playing as Shadow, perform a few tricks. If you listen closely, you can hear the
announcer say She has made a perfect landing! or She landed perfectly and has taken
advantage of the speed boost.