ドラゴンクエストモンスターズジョーカー (Dragon Quest Monsters - Joker) is a role-playing game developed and published by Square Enix for the Nintendo DS in Japan. It is the fourth installment in the Dragon Quest Monsters series and the sequel to Dragon Quest Monsters: Caravan Heart. The game follows the adventures of a young monster hunter as he explores an island while trying to become the world's greatest monster master. The game's story revolves around a young boy named Joker who is sent to the island of GreatLog to compete in the Monster Scout Challenge. In the challenge, the player must collect monsters, raise them, and battle them against other monsters. Joker must also discover the secrets of the island and the mysterious power of the monsters that inhabit it. The game features a variety of monsters to collect and battle, including classic monsters from the Dragon Quest series, as well as new monsters. Players can also transfer monsters from the previous games in the series, Dragon Quest Monsters: Caravan Heart and Dragon Quest Monsters: Joker 2. The game also features various mini-games and side-quests, as well as the ability to create custom monsters. Dragon Quest Monsters - Joker is a deep and engaging role-playing game with a classic Dragon Quest feel. Players can explore the island of GreatLog, collect monsters, and battle against other monsters in an effort to become the world's greatest monster master.