In Sonic Rush, the only characters you can play as is Sonic and Blaze. So, the aim of the game is to go thru 2 courses and defeat a boss, there are 7 different levels, so technically 21 stages (7 bosses exact after each 2 courses), and as I said the only two characters are Blaze and Sonic. GRRRRRRR bruh just- e Also I have to say There are actually 9 bosses but 7 after each course The last 2; 1st out of 2 The last boss then you complete the main game Then (for Sonics part) if you complete that boss, you unlock Blaze, and YOU HAVE TO GO THRU EVERYTHING AGAIN (luckilly i defeated the game 5 YEARS ago :')) And after u defeat Blazes "Story", you unlock this big hard boss scene with BOTH sonic and blaze and u aim on defeating Dr. Eggman + Dr Eggman Nega (thats the name OK) then u defeat the game- I JUST EXPLAINED THE WHOLE GAME XD