[acomjean]

Or 80s Merlin’s Magic square game.

https://en.wikipedia.org/wiki/Merlin_(console)

Which was only 3x3. But red LEDs which were all the rage in handhelds in the 80s.

When learning JavaScript I made a dupe of the Merlin game in JavaScript. It’s really old but still seems to run. Lacks the depth of this game with its larger grid.

https://www.aramcomjean.com/magic_squares.html

[noduerme]

Amazing. I had one of these, and playing your version just took me back to the frustration I had figuring out that game when I was 7 years old.