Gacha

Lottery systems, also known by the Japanese term gacha, are a recurring element in select Final Fantasy titles. These systems add an element of random chance to the games in which they appear. Frequently, lotteries use a game's premium currency as a means for the player to acquire better units and equipment. Microtransactions can also be used to participate in a lottery; thus, lottery can be seen as a major revenue driver for a particular game.