There are four different game modes in this title - Tower, Puzzle, Extreme Puzzle, and Rush - but your aim is pretty much the same in all of them: construct words using as many of the on-screen letters as possible. Now, you can also play it on your iMac or MacBook. SpellTower is an excellent word game that managed to bag a Pocket Gamer Gold Award on the iPad. Stages start out pretty easy, but quickly become tricky as spiders, electricity, and even ghosts stand in the way of your feeding the lovable Om Nom. Still, ZeptoLab's puzzler is one of the best around. Hell, you can even play it in Google's Chrome web browser. It's available on most smartphones and tablets, after all. You've probably played Cut the Rope already. There are now loads of OS X Game Center-enabled apps and games available to download from the Mac App Store, and many of them boast cross-platform (with iOS) features. Well, one of Mountain Lion's major new features was Game Center - Apple's very own Xbox Live-esque social network, which allows you to unlock achievements and compete on global leaderboards. Back in September, Cupertino-based tech company Apple launched OS X Mountain Lion, the latest version of The Big A's increasingly popular desktop operating system.