@Plasma beat me to it, but no matter how high the wattage, I just can't keep those little B@s3$%S off my lawn!
Are you looking for a genuine legacy kit/project or a more modern invocation? Many, but not all, of the easy "entertainment" article projects sucked. While I read the thread and can appreciate your tennis game, I would not spend much time playing it - do you?
As for 'pong', yeah - I am nearly finished with the enclosure and will post in that thread when I am finished (assuming I don't brick it along the way). Quite cool - and quite playable. If you read that thread, you will see a GI catalog link that shows that toward the end of that niche era, they had some pretty sophisticated chips that went well beyond 'pong'. Color, and including a bunch of games - tank games and a whole load of stuff. You are very good at tracking these down and that would be a cool project, but maybe not all that easy.
Another one that is much easier are all the LED reaction time variants. Here is a simple example
https://www.ebay.com/itm/POT-SHOT-v...ce-skill-toy-kit-set-NOS-/303827765869?_ul=IL
Years ago, I went into a 'Dave and Busters', which is basically a casino for kids. They had a very playable one of these and a year or so ago I decided to build a pseudo-modern version.
An LED flashes indicating your target (randomly chosen). Then, a legacy 74154 (4 to 16 line multiplexer) sequentially flashes the 16 LEDs and you have to press the button when the target is lit. You can adjust the intensity of LEDs and the sequencing speed (the pots). I have period-appropriate sound effects (which is all that is in my repertoire) coming out of a dirt-cheap speaker. An Arduino clone (you can see it in the pic) runs the whole thing.
I have show-and-tell'd this with at least 4 people and it is actually a lot of fun to play! One feature that I thought of adding was that you start at a medium speed and if you catch it, the next trial is faster. If you miss, the next trial is slower. Hence you get a score based on a larger n ....then I thought, enough - forget the feature creature. Yeah, I have to get it off the breadboard (stop nagging me - what, are you my wife?).
You could build one of these and add all kinds of stuff....imagine...There could be a universally accepted "Falter" score that clinicians would use to diagnose slower-than-molasses people. The sky is the limit.
Alternatively, you could create something that would solve the generations old question of how these things work - hey I would watch that video!