One app? It would be something called the "phone" app, or the "SMS" app, or the "iPod" app. Unless you're talking about one game, then it would be Plants vs Zombies, single most refined and addictive game in the entire store. Of course it's for those of us without pre-adolescence insecurity problems of liking something cute.
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Been thinking about getting it for a while, but now I think you've convinced me. Gonna go see about downloading it now...
Probably iNethack. I've been playing that game intermittently for years and still haven't gotten half-way through. Incredibly addicting nonetheless.
I know me too. Right now I'm still enjoying perfect cell, and really liking cover orange. Also archibald is just an amazing classic I highly suggest anyone try who hasn't. So I probably continue in that order of matter.
I dunno if anyone had said this already, but for me, it would definitely be the facebook app. cant live without it