Mad Dash Racing

All characters:
Pause game play, then hold L and press X, B, Left, Y, Right(2).

50 balls:
Pause game play, then hold L and press Up, X, B, Y, Left(2).

Never get hit by items:
Pause game play, then hold L and press X, B, B, Left(2), Y, B.

Have fruits during entire race:
Pause game play, then hold R and press B, X, Left(2), Y.

Flying abilities for any character:
Pause game play, then hold L and press X, Y, A, Left(2), Right(2).

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

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

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.