It's either Where's Waldo? for the iPhone generation, or hell for anyone who has ever lost their keys in a messy room. Pictureka presents gamers with a screen cluttered with objects, and a list of things they must find (think five pieces of fruit, or six objects from space). Find them all before the clock runs out and get rewarded with. . . a new list. Trust us, it's more addictive than it sounds.