Each monster has an element, and each element has a strength or weakness toward another. As in Pokémon, defeated monsters may be caught by the player and used on his own team. This allows the execution of combos, which are central to gameplay. However, unlike other match-three games, the game allows freedom to move the selected orb and swap it with its surrounding orbs for a certain amount of time. To attack, the player must line up three or more orbs of the same element. The player has a team of monsters, and explores dungeons to fight other monsters. In general, it is considered the game to have really caused the ' Gacha Games' to really take off, especially in Japan. And according to App Annie's 2013 Retrospective Report, its revenue in 2013 had even surpassed Candy Crush Saga. To put it in perspective, over the course of 2013 Gungho's profit had (at one point) exceeded that of Nintendo, largely by this game alone. Puzzle & Dragons is overwhelmingly popular in Japan, making a profit of US$54 million a month. Puzzle & Dragons (shortened to PazuDora in Japanese or PAD in English) is a Japanese puzzle/role-playing game for iOS, Android, and Kindle Fire, developed and published by Gung Ho Online Entertainment.