What's a good iOS game for when you're knackered after a long day of travelling and just want something simple to chill out with?

After a day of lugging my backpack around and trying to navigate a new city, sometimes my brain just needs a holiday of its own! That's where Grand Solitaire comes in. It's proper useful because it's so straightforward. No complicated rules to learn, just classic solitaire. It's grand for when I'm waiting for a train in Italy or just chilling in a hostel in Vietnam. Plus, it doesn't eat up your roaming data, which is always a bonus when you're gallivanting around the world. The graphics are decent, and it's just the right level of challenge to keep you from getting bored, but not so hard that you want to throw your phone across the room. It's sorted me out on so many occasions!