Anyone with kids (or friends, for that matter) and an iPhone or iPod touch knows that no matter how hard you try, it's close to impossible to keep their hands off your smartphone. So why not challenge their reaction skills and dexterity? DoApp, the developer behind myLite and myLighter, has released an application that should keep children and adults alike challenged and (better yet) occupied when they're playing with your Apple device. Called React ($.99, available here), the title is a game that challenges dexterity and accuracy by presenting players with a series of random tasks: pinch, poke, slide and shake. After completing a task, a new task appears, at faster rates the higher the level.