Recommend any OFFLINE Android Games with no ads?

Evening, all.

Looking for recommendations for any Android games that you enjoy which can be played completely offline without a data connection of any sort.

These used to be super common once upon a time, but these days it seems every single game I try just doesn't function if you are totally out of service area.

Would appreciate any tips! Thanks in advance.

EDIT: Some great suggestions in here! That will keep them busy a while. Thanks so much everyone.