11. These items are usually rarer items or crystals needed to unlock additional characters . 12. A story mode and additional characters were added through updates and downloadable content. 13. Additional characters and tracks for the game have been released as downloadable content.14. An additional character , Steeplejack, starred in a backup feature in the second issue. 15. The PSP version includes wireless multiplayer and additional character customization. 16. A downloadable patch available on the official website adds additional characters to the game. 17. It's possible to use additional characters for more groupings, for example + and -. 18. The PlayStation 2 version features additional characters and gameplay modes. 19. The five digits can be extended by three digits further representing three additional characters . 20. Earn enough points and you'll be able to unlock additional characters to play as.
