Enabling this feature requires going into already cleared missions and collecting ALL the secret items (except Movie 36).

At the start of the level when Sonic is counting down swing the Wiimote after he says 'One' but before 'Go' and sonic will boost out in a spindash to start the level.

When you have completed ALL the missions with S-Ranks the game's final mission will become unlocked. Find the hidden item and complete this mission and you will be able to view the 'Sonic Omake' cutscene.

When you have collected ALL the Art, Music, Secret Documents and Movies (except for Movie #36) the final Adabat mission will become unlocked.

This feature can be accessed if you enter Y, X, L, B, R, A at the 'Cheat Input option' using a GameCube controler.