To the one that has suggested Mobile Legends, you are not going to enjoy it offline. It is a battle ground or MOBA game that requires internet connection.
There is an AI mode for that game right? I would highly suggest RPG mobile games that are offline.
They are more enjoyable if you have a lot of time but when you grow older, I doubt it you will able to finish it quickly.
Yeah Mobile legends is not an offline game si maybe better for OP
To consider disregarding that one though he seems to be a fan of puzzle games that made him enjoying
But also I may advise sone tactical games like chess,games of the general and Scrabble
But of course those are old-school games that he needs to dig where to find online but Facebook has the two of those.
I like those conventional and mind games that you've mentioned. I have them before but you know as you grow older, you start to have preferred genres, consoles, etc.
I am done with the era of mobile gaming and I like more PC gaming. But sometimes when I get bored, I still have some games on my phone but most of them are games with emulators.