Take a look at my collection of handheld games from the 1970s that are mechanical, rather than electronic, even though some are deliberately modelled after video games. Since they don't use microprocessors, they could be considered Zero-Bit games.

I made a sort-of sequel to this video "4-Bit Handheld Games: Tron, Scramble, Lupin, and Caveman by Tomy":    • 4-Bit Video Games: Tron, Scramble, Lu...  

Links:
Electro Tic-Tac-Toe: https://www.retrothing.com/2007/08/fi...
Blip video by Tech Tangents:    • Blip - 1977 Mechanical Pong  
Digital Derby breakdown/repair by Randi Rain:    • The breakdown and repair of the cleve...  

Become a patron:   / 8bitshowandtell  
One-time donation: https://paypal.me/8BitShowAndTell

Ending music is "Praises Are Spent" from the unreleased album "Sole Behold" by Bedford Level Experiment: https://bedfordlevelexperiment.bandca...

Index:
0:00 Intro
0:29 Draw Poker (Waco, 1971)
3:12 21 "Black-Jack" (Waco, 1973)
8:50 Drive Yourself Crazy (Tomy, 1976)
14:08 Blip: The Digital Game (Tomy, 1977)
17:39 Digital Derby (Tomy, 1978)
23:41 Strolling Bowling (Tomy, 1979)
27:48 Thanks to my patrons