Don't usually plug stuff like this but thought this site was a good laugh. You basically play old TV gameshows as if you were a contestant, they all have the proper gameshow settings, voices and music. There are 4 at the moment, Countdown, Catchphrase, Blockbusters and Family Fortunes. I think Catchphrase works the best personally but they're all worth a go, they overcome the problem how you input answers reasonably well.
You'll need broadband and a reasonable computer to run them (1 GHz/256 RAM it says).