Yeah, I've only played the iOS version but I've had a lot of fun with it. I like it more than, say, Ascencion (which is Playdek's other big iOS deck-building thingamy), but as someone who has two-and-a-half shelves of White Wolf "Supernatural Being: The Overwrought Noun" books that could just be because I'm a bit of a mark for the theme.

I get the feeling Nightfall is something that's much better suited to being an iOS game than a physical one, though. I do like the "Dominion, but with two exclusive Supply piles each" setup but I'm not convinced there's quite enough game there to justify the time to physically set it up and break it down each time. Also: I've got a sneaking suspicion it would manage to be too short a game but take too long to play, if that makes any sense at all. A lot of games of Nightfall seem to just sort of suddenly end, without much of a sense of crescendo or climax, which is OK on the iPad where you can just rip off several games on the bounce but would be more noticable around a table. On the other hand, I think the chaining mechanic would cause horrible analysis paralysis with certain members of my usual group, both when playing cards but also when buying them.

Another well-implemented card game on the iPhone that ate several evenings after I grabbed it for 69p: Lost Cities. It's got almost no theme at all but it's a really fun little game.

Oh, and a slightly weird example of something that works the other way round, where the physical version is almost less hassle than playing on iOS: Summoner Wars. I love Summoner Wars, but as it currently stands the iOS version is just too slow and fiddly to play it regularly. It's such a shame, it really just needs a bit of spit-and-polish (and especially a bloody "undo last move" button) and it would be absolutely fantastic.