Overturn (1987)

From the designers of Othello.

Overturn sports a modular board that changes with every game. It's kind of like a "find the hidden word" puzzles you used to play in the newspaper. Each player places colored rings over letters to make words. If you use the rings already placed by your opponent, you may turn the rings over to your color. Winner is the one with the most rings after all the letters have been used, or no more words can be made.

Essentially Othello with words.

1993 Mensa Select