What's a brilliant iOS game for quick races with your mates, even when you're all scattered across the globe?

Honestly, Fun Run 4 has saved me from boredom on so many long bus journeys! It's proper useful for a quick game with friends, especially when you're trying to coordinate timezones. I've played it with pals in Australia while I was stuck in a hostel in Berlin, and it works a treat. The races are short and sweet, so it's perfect for killing time without needing to invest ages. Plus, it doesn't eat up your roaming data too badly, which is always a bonus when you're hopping around countries. It's grand for a bit of lighthearted competition, and the customisation options for your character are gas. Definitely a top pick if you're after something simple but addictive for your travels.