What's a grand little Android game to pass the time when you're stuck on a long train journey, like from Rome to Florence?

Oh, Square Race is just the ticket! I stumbled upon it before my big Interrail trip, and it's been a lifesaver ever since. It's dead simple, you see – just tapping the screen to keep a square going. Sounds basic, but it gets proper addictive when you're trying to beat your high score. The best bit? It works perfectly offline, which is crucial when you're gallivanting around Europe and don't want to eat up your roaming data. I was playing it non-stop on that train from Rome to Florence, and it made the journey fly by. Plus, it's free, so you can't go wrong giving it a go. Seriously, it's a brilliant little time-killer for any traveller!