I'm surprised no one mentioned the 2 venerable B & E game shows, The Joker's Wild & Tic Tac Dough. Those are 2 that I can easily play along with.
As far as J! goes, I didn't get the J! Challenger back in the 90's. But a few years ago when I was at my oldest niece's house, whenever there was a calculator lying around, I use that as my own personal "scorekeeper". I added accordingly for right answers, subtracted accordinglly for wrong answers. For the Daily Double, I made my own wagers based on my knowledge of certain categories. Most of the time I didn't do too well, but one time I scored over $10K. A great way to play along without the need for that Challenger thingy.