Pokémon Mystery Dungeon: Explorers of Sky[a] is an enhanced version of Pokémon Mystery Dungeon: Explorers of Time and Explorers of Darkness released for the Nintendo DS in 2009, developed by Chunsoft and published by The Pokémon Company and Nintendo. As a sister game, and sometimes referred to as the definitive edition to the aforementioned games, additional features include the addition of the missing Generation IV Pokémon, further character development for a few side characters in content known as Special Episodes, and a few quality of life improvement for options, items, and other gameplay related features.
In terms of gameplay and premise, Explorers of Sky is largely similar to its predecessors, where a human-turned-Pokémon joins an exploration team, explores shifting dungeons, and fights hostile Pokémon through turn-based combat. The three games had accumulated worldwide sales in excess of 5.9 million copies in 2010, then 6.37 million copies after 2010. Upon its release, the game received mixed reviews from critics, in opposition to the fans’ reception which was notably more positive, with many considering it a cult classic and the best game in the Mystery Dungeon series overall.