Pokémon Mystery Dungeon: Explorers of Time (Japanese: ポケモン不思議のダンジョン 時の探検隊 Pokémon Mystery Dungeon: Explorers of Time) and Pokémon Mystery Dungeon: Explorers of Darkness (Japanese: ポケモン不思議のダンジョン 闇の探検隊 Pokémon Mystery Dungeon: Explorers of Darkness) are a matched pair of Pokémon games for the Nintendo DS. These games are the second pair of entries in the Pokémon Mystery Dungeon series, an adaptation of the Mystery Dungeon games for Pokémon. The games are successors to Pokémon Mystery Dungeon: Red Rescue Team and Blue Rescue Team. They include the new Generation IV Pokémon and have some Wi-Fi features, as well as more dual-screen features than their predecessor for the same system (Pokémon Mystery Dungeon: Blue Rescue Team). An anime adaptation of these games has been produced. These games feature 491 Pokémon; Shaymin and Arceus were excluded for they had yet to be officially revealed when the games were released. The games were released on April 20, 2008. A third installment was developed by Chunsoft and was released on April 18, 2009 in Japan.