Roguelikes and roguelites are generally a pretty good choice for a second screen game, but depending on what you’re doing on your other screen, some may not work out. An action dungeon-crawler, for ...
And instead of randomly picking a fuzzball to retrieve, players draw cards that direct them toward a color or some difficult-to-manage technique (like plucking a ball with your eyes closed).
If you're on a Galaxy Fold, consider unfolding your phone or viewing it in full screen to best optimize your experience.