Yes I use Seek. It's primarily just iNaturalist's identification AI with a tiny bit of gamification. Badges are cute but it doesn't really go past "observe 10 bird species", "observe 100 bird species", "observe 1,000 bird species", etc. There's monthly challenges too but they're usually just "observe 10 [herbivores|parasitic plants|species in protected areas|etc]". Don't get me wrong I love the app and everything iNaturalist is doing but it's not a full-featured game by any means