Probably ‘pong’ as in table tennis a win score is achieved or alternative similar games , only a limited number of balls were served or timed out on a game end clock.?
Similarly early driving games were once at the finish line was end of credit..win or 2nd 3rd place result?
Early 80s games I am sure had an end Hunchback rescues Esmeralda after several screens but other games introduced ‘add credit to continue’ so were made more endless to generate income especially like Ikari Warriors 2 player interactive add coin to join add coin to continue etc
Many do end and you register a high score but don’t recall which ones once so many were launched… I know back in the late 70s visiting game distributors showrooms was the best day out you could imagine assuming they believed you were interested in buying one of course … Associated Leisure in Warrington was brilliant as was Hazelgrove Music at Cheadle they both supplied brewery pub sites so had all the latest stuff in the showrooms … wow!
I may be wrong can’t recall that many that I could actually complete myself but the wife gets through ALL 30 levels of PuzzleBobble with ease and achieves about 16,500,000 points and a hall of fame roll up ‘names or initials’ as many high score recording games did too , but going back to the question , I think a lot of b/w 70s sport based games just ended ?
Coin spent score noted smiling face walk away either happy or ashamed with personal performance . Maybe return next day with a few more 10p s as the words GAME OVER burn immortally into the screen …