If you have an Android phone (not sure if any of these games are for iOS or Win8), go to your apps store and search for "Hangame" or "NHN". It's a Korean apps distributor that makes Engrish, Japanese and of course Korean games. Look for the app called 駄菓子屋ゲーム. (In Japanese, it means "little candy store game"). It's a set of 4 coin-op arcade machines like the one seen in this picture:
The game is infuriatingly addicting. I haven't cussed that much on the bus in a long while. You can potentially beat it in a couple hours (I'm halfway through) and it's pretty easy once you figure out how to master each machine. But even once you know the tricks, it still takes a lot of concentration and some luck to win.
They have a bunch of other little games too, in addition to hanafuda (Japanese cards), the card game Speed, and some RPGs as well.