Not sure what cache you are referring to.
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A fizzy challenge is exactly what you created, a challenge to fill in your entire D/T grid, and some add in other things like so many types of caches, or do mini versions (All terrains at Difficulty 2.5 or something like that.)
Link to a search of a lot of them:
http://www.geocaching.com/seek/neare...zzy&submit4=Go
What is a fizzy challenge? You get to drink lots of fizzy drinks? Ha Ha!!!