If he likes puzzles, Bitcoin Bay is super fun!
Any of the games here: https://www.thndr.games/bitcoin-games
But I think Bounce, Snake, or Turbo would be good for him!
Discussion
I was able to download a bunch of the games for him. He played mainly bitcoin bounce before he had to go. I showed him how to withdraw to his lightning wallet. I'll tell him to test out Bitcoin Bay. Thanks!