Inferno Cave (Japanese: れっかのどうくつInferno Cave) is a dungeon exclusive to Pokémon Mystery Dungeon: Explorers of Sky which is accessible after receiving the challenge request from Entei. It is mainly filled with Fire-type Pokémon. Like Southeastern Islands, only the leader can enter this dungeon, and it cannot be entered until the player's team has reached Guildmaster Rank. Inferno Cave's difficult characteristics and tight restrictions are similar to thethreedungeons before it: the player cannot bring any money, is only allowed eight items, cannot call for a rescue upon being defeated, and may encounter Random Traps and Grudge Traps along the way. The last floor contains one Deluxe Box containing an IQ Booster and a Warp Zone to transport the player out of the dungeon.