What's a good Android game to play when I need something mindless but kinda strategic during those super long shifts?

Seriously, after a 12-hour shift, my brain's fried. I need something that doesn't require a ton of focus, but also isn't completely boring. 'Stealth Master: Assassin Ninja' actually fits the bill. It's got that whole sneaking around thing, and you gotta figure out the best way to take out the guards without getting caught. It's like a little puzzle, but with ninjas. And honestly? It's actually reliable. I've been playing it for like, six months now, and it hasn't crashed on me once, which is saying something. I usually play it during my lunch break or when I have a few minutes between patients at the clinic. It's a no-fuss approach to gaming, which is exactly what I need when I'm running on fumes. Plus, the levels are short, so I don't have to worry about getting sucked in for too long.