What's a good, actually reliable Android game to play during my downtime at the clinic that's kinda like a mental palate cleanser?

Seriously, after dealing with everything at the clinic, the last thing I need is a complicated game. "Hello Words" is perfect 'cause it's straightforward. I'm too tired to learn complicated apps, but this is so easy to pick up. It's like having a little brain massage. I usually play it during my lunch break or those few minutes when I'm waiting for lab results. It's actually reliable, which is a HUGE plus. I swear, some apps crash more than my energy levels after a 12-hour shift! Plus, it's kinda satisfying to find all the words, you know? It's not gonna win any awards for graphics or anything, but it works when you need it, and that's what matters to me. Honestly, it's become part of my routine, like my morning coffee... except less likely to give me the jitters.