THEL No, the issue isn't unique to your G4, IKE1999...
There's definitely some major bloat/leak happening somewhere as the Scrabble app runs. I monitor CPU usage (in the top menu bar) constantly, using MenuMeters, and by the middle of the fourth or fifth consecutive Scrabble game, my 1 GHz G4 hits 100% and the game lags severely, requiring a quit and relaunch to clear [whatever-it-is] out of the way.
None of my other apps behave this way, and it's 100% repeatable, even when only the Finder and Scrabble are running.
I *love* the game! But this certainly needs to be fixed.
(Version 1.0)