Max Gittel's science-themed zen-like puzzle game Atomas, free for your iOS, is the sort of sneakily simple looking game that's a perfect fit for smartphones and tablets... something clean and elegant looking you can pull out and play for a few minutes, but clever and addictive enough that you'll probably catch yourself fiddling with it for a lot longer. The goal is to create the highest score possible by placing and combining elements around the edge of the circular playing field. Each element has a value, and if you place a Plus element between two identical ones, they'll combine to create a new, higher value element. If there are matching elements on either side of the pair you just combined, you'll start a chain reaction where they (and any other pairs bracketing the point of combination) are added in as well. Occasionally, you'll be granted a Minus element, which will let you remove any element on the board and place it elsewhere, or, if you prefer, convert it into a Plus. When the board is completely filled, the game is over, so trying to plan out how your elements are arranged as you place them is crucial to getting a high score! Lucky Charms are awarded as you progress, and when you equip one from the main menu, it'll grant you a passive bonus, like an increased chance of receiving Pluses or Minuses. If things are really desperate, you can use an Antimatter blast to partially clear the board, though as of this writing it appears the only way to gain those is to buy them through in-app purchases.