I'm a big fan of their "Seek" app and have used it a bunch. It has a similar "game" loop like Pokemon Go, but without any mtx, plus you learn a lot about your local ecosystems.
If you have kids I highly recommend pulling out the app during a nature walk.
Microtransactions, sometimes abbreviated as mtx, are a business model where users can purchase virtual goods with micropayments within a game. Microtransactions are often used in free-to-play games to provide a revenue source for the developers.
If you have kids I highly recommend pulling out the app during a nature walk.