All characters:
Pause game play, then hold L and press X, B, LEFT, Y, RIGHT, RIGHT.

50 balls:
Pause game play, then hold L and press UP, X, B, Y, LEFT, LEFT.

Never get hit by items:
Pause game play, then hold L and press X, B, B, LEFT, LEFT, Y, B.

Have fruits during entire race:
Pause game play, then hold R and press B, X, LEFT, LEFT, Y.

Gex:
Successfully complete the game with all three default characters in time
challenge, stunt challenge, and cash trial modes with all medals.

Synder:
Get the time challenge goal for every level to unlock Synder.

Tek-9 glider:
Successfully complete the game with any character to unlock the Tek-9 glider.

Hex:
Successfully complete the game with Chops, Sid, and Zero-G to unlock Hex as a
selectable character