@sealionact: It's cross-buy on Sony. Buy the PS4 version and you get the Vita version too. Not sure it's actually cross-save though, but the game is definitely available on the Vita. Oddly, not on the 3DS, which is a shame, because you could see the map in the lower screen and game in the top with the first one, which was handy. Either way, it's a fantastic game and totally worth getting. Also, despite being pretty huge, still under 300 or even 200 megs (depending on the platform).