Classic Concentration made such smart changes to the main game. Going to 25 squares. Revealing the natural match after a wild card. Getting rid of forfeits. The changes were far less severe than Narz's three squares in a turn.
I thought Double Play was goofy. Rebuses should be pretty straightforward when you see the whole thing, and I don't like a climactic grand prize game in only 10 seconds. (I didn't like it on Scrabble, either.)
My idea for a show format: self-contained, two puzzles out of three, the third puzzle a tie-breaker with hands on buzzers. If one player wins both regular games, he plays the third puzzle against the clock for extra seconds in the end game. I'd use the car game format but with dollar amounts. Then they could put cars in the main game, either halves of the car or a random shot.