Until the late '70s, there were nighttime editions of TPIR, Hollywood Squares, LMAD, Name That Tune, and Match Game that aired weekly, primarily as a lead-in to primetime.
However, there have been a few daily syndie game shows in which, due to scheduling commitments with other shows, have aired only on weekends.
One major example is the New TPIR with Doug Davidson; some markets including Fairbanks and Philadelphia opted to air it on weekends as opposed to weeknights. Like I said before, Fairbanks saw it Saturday and Sunday nights at 6:30 on KATN, and I think sister station KIMO in Anchorage (now KYUR) did the same.
And as I said in the uncleared syndie game shows in major markets thread, WXIA here in Atlanta had the $100,000 Name That Tune (Jim Lange) Saturday nights at 7:30 only. My guess is that they showed a winning episode from the week of shows they taped off the satellite and stockpiled all week, though they could've ran them late nights after David Letterman instead. After all, it was WXIA who three years earlier had the "You Asked For It" revival with Rich Little (also by Sandy Frank), which would be crushed by "PM Magazine" on WAGA as well as a brand new show over on WSB: "Entertainment Tonight", which they still air at 7:30 to this day.
Anyway...were there any others like these that never aired weekdays but had to wait till the weekends for?