Alright, now this whole social gaming fad is serious stuff. The Royal Navy has enlisted iPhone app developer Marvellous to create a new version of Royal Navy: Engineer Officer Challenge, a free game that this British military arm hopes will spur more recruits. The game, originally released in 2009, presents five challenges that an Engineer Officer might face aboard a destroyer (through a 3.5-inch screen). Marketing Magazine reports that the game is designed to test players' decision making under pressure. Of course, to help spread the news of your mobile naval prowess, you can post scores to Facebook.