To this day, I have only seen bits and pieces of H2's Game Show Week, but from what I've seen that potentially could be a favorite of mine.
Scrabble's game show host week was a favorite of mine, with Chuck Woolery sharing hosting duties with many of the others.
The Crosswits episode with Kennedy/Peck/Goen/Tomarken (was there more than one???) was a trainwreck with the "players" destroying David Sparks.
I would have loved to see some of the game show host weeks of the early-mid 70s that NBC did to cross-promote their daytime shows. The 2nd Edition EOTVGS has a photo of Art Fleming, Joe Garagiola and Bob Clayton all playing The Who What Where Game, for example.