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As for pipedream itself, just get medals through all the showoffs.
If you want to get UNTRACKED, you have to get gold in all races and in the showoffs. To get PIPEDREAM, you have to get a medal in ALOHA ICE JAM race, and all the other showoff courses. Once you get gold in PIPEDREAM and ALOHA ICE JAM you can ride UNTRACKED.
I know all the shortcuts for this game, and some really BIG points scorers on PIPEDREAM, so E-mail me at [email protected] if you want more info.
Just a tip for you, punch in O X X X X on the main screen mode to get a list of tips etc. Repeat to turn off.