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