Apple has revised the guidelines for its App Store, including a provision that loot boxes must be transparent about their odds. "Apps offering 'loot boxes' or other mechanisms that provide randomized virtual items for purchase must disclose the odds of receiving each type of item to customers prior to purchase," reads the new rule, which will affect the most popular games on iOS, including Hearthstone, The Simpsons Tapped Out, and Clash Royale. Kotaku reports: Loot boxes, which have always been common in the world of iOS gaming, are virtual grab bags that can give players a host of items ranging from common to rare. Most of the time, you can buy these loot boxes not just for in-game currency but for real money, which has led some players to classify them as gambling -- a label that the Entertainment Software Rating Board doesn't acknowledge. As rage over these practices gets louder and louder, Apple's move is the first of what may be many steps that game publishers and distributors voluntarily take in an attempt to avoid regulation from outside bodies.