Which is equally insane, no?

Doesn’t work on my phone (made for an older version of android) but it looks like the game “set”, and googling that I found this: https://play.google.com/store/apps/details?id=com.nelis.set (haven’t tried it yet but it has the tag “offline” so looks good)

Simon Tatham’s puzzle collection is my fallback game for whenever I don’t have internet or am bored with whatever other game I’m playing