Sonic and the Secret Rings/Lost Prologue

The first eight are to get the player used to playing the game. There are a total mission number of 21. They open at various levels.
 * Missions:
 * 9,10-after getting the soul gauge
 * 11-level 21/ *12-45 silver medals
 * 13-level20/  *14-level 35/
 * 15-level5/   *16-level 42/
 * 17-level2/   *18-level 19
 * 19-level 46/
 * 20-after defaeting Sand Scorion and Ifrit Golem
 * 21-after defeating Captain Bemoth and Erazor Djinn