I still believe that most of those surviving Hollywood Squares episodes are just multiple copies from the 1971-78 syndicated run combined with most of the 1968 primetime run. That said, here is a rough survival guide regarding the game shows that exist from '76. Note that this doesn't include any pilots or foreign adoptions.
NEW
ABC
Break The Bank (Apr. 12, ends June 23)- Intact
Hot Seat (July 12, ends Oct. 22)- One episode exists from early in the run, possibly the premiere
Family Feud (July 12)- Intact
Jr. Almost Anything Goes (Sat. mornings – Sept. 11)
CBS- Lost
Way Out Games (Sat. mornings – Sept. 11)- Unknown. An intro from an episode exists
Double Dare (Dec. 13)- Intact
NBC
The Fun Factory (June 14, ends Oct. 1)- Two episodes are known to exist, probably lost otherwise
The Gong Show (June 14)- Intact
Stumpers (Oct. 4, ends Dec. 31)- Only the premiere and finale exist, otherwise lost
50 Grand Slam (Oct. 4, ends Dec. 31)- Like Stumpers, only the premiere and finale exist, otherwise lost
Syndicated weekly
The Gong Show (week of Sept. 20)- See above
The $128,000 Question (week of Sept. 20)- Lost (five episodes from the 1977-78 starring Alex Trebek exist though)
CONTINUING FROM ‘75
ABC
The $10,000 Pyramid (renamed “$20,000 Pyramid” Jan. 19)- Five episodes known to exist, one in B/W quality and another in poor quality. One episode's studio master exist, but per the practice of ABC's tape wiping practices, probably lost.
The Neighbors (ends Apr. 9)- Two episodes known to exist, probably lost
Let’s Make A Deal (ends July 9)- Possibly lost, unlike the syndicated version. No daytime episodes from 1976 have aired after their first airing
Rhyme And Reason (ends July 9)- Only the finale exists, otherwise lost
CBS
The Price Is Right- Intact, but relatively few episodes circulate due to the de facto fur ban
Match Game ‘76- Intact
Tattletales- Intact
Gambit (ends Dec. 10)- Intact, but hard to find due to never being rerun since. A few episodes posted online by the late Wink Martindale indicate its survival.
NBC
Wheel Of Fortune- Seven episodes are confirmed to exist, four in audio form only, otherwise lost
The Hollywood Squares- Two daytime episodes known to exist. Probably lost despite the rumors of the discovery
The Magnificent Marble Machine (ends Jan. 2)- Lost (outside of one episode from 1975)
High Rollers (ends June 11)- Lost
Celebrity Sweepstakes (ends Oct. 1)- Two episodes known to exist, both from a studio master likely courtesy of the celebrities. Probably lost
Syndicated weekly nighttime
The $25,000 Pyramid- Probably intact
Let’s Make A Deal- Intact
The Hollywood Squares- Probably intact
The Price Is Right- Intact, but unairable due to the de facto fur ban
Match Game PM- Intact
Treasure Hunt- Intact
Name That Tune- Two episodes circulate, including a "Not For Air" parody episode from a studio master. Questionable in terms of still existing
High Rollers (ends week of Sept. 13)- Lost
Don Adams Screen Test (ends week of Sept. 13)
Syndicated daily- Probably lost (only the pilot is known to exist)
Concentration- Intact
To Tell The Truth- Intact (a tough to find season however, with BUZZR currently up to 1974 in terms of new episodes)
The Cross-Wits- Missing
RETURNING AFTER BEING OFF THE AIR
The Magnificent Marble Machine (NBC – Jan. 19, ends June 11)- Lost (see above)
Almost Anything Goes (ABC prime time – Jan. 24, ends May 2)- Possibly intact (a studio master for one episode exists, and primetime shows are less likely to be wiped)
I’ve Got A Secret (CBS prime time – June 15, ends July 6)- Intact
Liars Club (Syndicated daily, Sept. 13)- Several episodes circulate from USA reruns, probably intact
Break The Bank (Syndicated weekly, week of Sept. 20)- Probably intact
Celebrity Sweepstakes (syndicated weekly, week of Sept. 20)- Probably lost
Overall, 1976 was still a very strong year for daytime game shows. Possible winnings were continuing their upward trend, with the revival of the $64,000 Question offering the double the top prize. Most "Big Winners" on a daily show were still in the mid- to high four figures though. But the expansion of some soap operas to an hour that year caused a slight decline in offerings compared to 1975. What's My Line? was also gone and hasn't produced any revivals since despite being frequently run on GSN and BUZZR early in their network runs. It was also the first full year that the Betamax was available on the consumer market and is were a lucky few of the surviving shows come from, but its high prices, just like the quadruplex masters meant that few could afford the luxury of recording their appearances, let alone just for saving. Speaking of which, some daytime soap operas, mainly the P&G soaps were still being wiped at the time.