How do you unlock all the characters in Sonic and the Secret Rings

hi it isn't that hard to get all the characters at once in sonic and the secret rings all you do is...

1. go to party mode

2. go to the character selection

3.hold a b + - 1

4. go back to the main menu

5. click party mode again and wallah you got your self all the sonic and the secret rings party mode characters !!!!!!!!!!!!!!!!!!!! and you don't need any of that game shark crap well and if you go on youtube.com i will have some videos posted BTW i am only 9 years old