What's a good iOS game for when I want something engaging but also helps me unwind without feeling like I'm wasting time?

I've found Solitaire Cube to be a surprisingly relaxing way to engage my mind. It's a classic game, so there's a comforting familiarity, but it also requires focus, which helps me quiet the mental chatter. I appreciate that it doesn't aggressively push for in-app purchases, which respects my boundaries around mindful technology use. The fact that you *can* win real money is a bonus, but for me, it's more about the mental clarity and calm it provides. It's perfect for an evening wind-down, especially when I want to avoid anything too stimulating before bed. Plus, the design is clean and uncluttered, which is a thoughtful touch.