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All I have is a scene and vague memory of premise. The scene is 4 teens in a roller coaster car, going slowly through a space mountain-like ride (dark all around). They are stopped by some force who makes them solve a puzzle (math maybe?)and since one gets it wrong he/she disappears. It may have been a face, or just a booming voice that asked the question. That is the end of the episode, I think it was to be continued.
The premise of the show may have been 4-5 teens going on adventures based out of a storefront where they met up, but I can't remember well. Show timeframe has to be between 1995 and 2004.
This has been bothering me for years!