If anyone is into trains (and/or subways), there's a really neat/fun/bizarre South Korean subway simulator app called Hmmsim (it's free, on the iPhone App Store - not sure if it's available for Android as well).
[1] https://play.google.com/store/apps/details?id=com.Jeminie.Hm...
[2] https://play.google.com/store/apps/details?id=com.Jeminie.Hm...