Pikmin: Spark/Dens

Dens are special subareas appearing in Pikmin: Spark. They are small underground caves appearing as holes in the sides of various structures in each of the five main areas. Dens appear randomly each day meaning if you found a location of a den entrance, that entrance would most likely not appear the next day. Dens contain many different items of interest that vary from den to den. Some dens have a large number of enemies to grow your Pikmin army with while other dens might feature a small puzzle with a reward in the form of a rare piece of Refuse. If going for the full completion and true ending of this game entering a large amount of dens is required as dens also contain enemies found nowhere else to record on your creature log as well as unique Refuse found nowhere else in the game that is needed to access the true final boss.

Types of Dens
Dens have a large variety of interiors due to being randomly generated like caves. However, the type of entrance to the dens can help determine just what type of den you are entering. Some den entrances can have multiple types mixed into a single entrance to combine into a single special den.

Small Entrance: The den is small in size, being roughly larger than a standard landing site. Usually contains either many small enemies and Refuse or a few larger enemies and/or single larger refuse.

Medium Entrance: The den contains more complex terrain and hazards with a larger focus on elemental hazards and enemies. Contains a larger assortment of creatures and Refuse.

Large Entrance: The den is the size of a small section of the main area, with a large variety of rooms and puzzles. This may contain a miniboss holding a rare piece of Refuse.

Scratched Entrance: The den has a lot of enemies, and often enemies that are found exclusively in dens.

Flattened Entrance: Contains a miniboss arena as the main focus of the den, larger entrances can contain two at once.

Shiny Entrance: Contains a large amount of Sparklium and Refuse as well as enemies that can create Sparklium.

Underwater Entrance: Only Blue Pikmin can enter it and features a large number of aquatic enemies and hazards.

Leafy Entrance: Features a large amount of Candypop buds, Pellet Poseys, and plant-based enemies and hazards.

Sandy Entrance: Contains enemies and hazards usually found in the Saltwater Glade.

Sooty Entrance: Contains enemies and hazards usually found in the Cavern of Cobwebs.

Snowy Entrance: Contains enemies and hazards usually found in the Chilling Frontier.

Grassy Entrance: Contains enemies and hazards usually found in the Fertile Savanna.

Metallic Entrance: Contains enemies and hazards usually found in the Rust Labyrinth.