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There is a similar sounding query here
and they seem to think that it was called Take Off
You don't have to keep reposting the same query, you can bump the old ones up the list by replying to them
Edited by jormis29 Working on cleaning up List Of Shows That Need Summary
That sounds like the same show. Sadly I can't find anything on anything called "Take Off."
I found a single page talking about a show called "Take Off" that sounds like the show I'm thinking of. As far as I can tell, this is the only reference to the show on the internet.
There is this thread discussing it and they uploaded an earlier episode
There was this Live Action TV show about this group of kids who went on magical learning adventures inside this old abandoned lot that was completely surrounded by a wood fence so that you couldn’t see inside. Inside was a portal to another dimension or something with all sorts of stuff that changed from episode to episode. I recall it being the first time I ever heard of the Knights and Knaves puzzle and it was played pretty straight here. If I recall correctly every episode was filled with logic puzzles very similar to that one. I remember one episode ended with another kid outside the main group looking through a hole in the fence and seeing some magic stuff and there was, I think, a story arc about adults wanting to build something on the empty lot. I’d say it was on tv in the late 80’s or early 90’s.