Concentration was an American game show, from the 50s and 60s, so maybe you never got to see it. The first part of the game - the concentration part - could not be duplicated on a message board. Contestants would pick two boxes at a time, and be shown a prize under each box. If the prizes did not match, they quickly flipped back to blank boxes. But if the prizes match, then they revealed a part of the puzzle.
So, there was really no "concentration" in this game. It was essentially just a rebus puzzle.
I don't know that there are any hard rules about rebus puzzles. I think they are mostly like graphic Charades, and can be anything that helps someone sound out the puzzle. Then, also keep in mind, that it was my stated purpose here to slow down the KLT puzzle players, because Jeopardy! and Crosswords were too easy for them.
So sounding out the last KLT Concentration puzzle:
- Jay + Leopard - L + Y! = Jeopardy!
- Pliers = Players (Maybe with a cockney accent, but that's why I had the asterisk there. Blimey!)
- See + Dog = Seadog.
- M&Ms + Marker - er = Mr and Mrs Marc.
- FÂ + Red Die = Freddie.
- Cadaver -CA ^F = Davefr. (Ha!)
- Fog + Malkovich - ovich + Kin = Fogmalkin. (The fog is appropriately over San Francisco.)
Those were all the player (pliers!) with positive scores, but in the reveal, I added Ms Understood, who had a zero score in KLT Jeopardy!
I'll post some other puzzles below from other message boards where I also hosted versions of Concentration. My favorite clues use an image of Al Gore, former US Vice President, because his name lends itself to many puzzles. In one of the extras below, Al Gore scrambled becomes "galore." Another time, Al Gore became "algorithm."