What's a good Android game for zoning out on the train but still, like, flexing the brain a little?

Okay, so Word Hike is this word puzzle game that's actually kinda addictive. It's not just crosswords, which I appreciate 'cause sometimes I'm not in the mood for straight-up vocab. They throw in these logic puzzles too, which is a nice change of pace. From a technical standpoint, the UI is clean, and it loads up quick, like in 2-3 seconds on my Pixel. It barely uses 60MB of RAM, so it's not a resource hog. Plus, the dev team really thought about offline play. I tested it, and it works perfectly even with airplane mode on. No more spaghetti code situations where you're stuck if the connection drops. The API integration is smooth, basically means it talks to other parts of the game really well. It's got that 'just one more level' thing going on, which is exactly what I need when I'm trying to avoid eye contact on the train.