Fungal Grotto

Fungal Grotto is an area in Pikmin: Infection in Progress that was previously from. Several hazards and obstacles can be found throughout the area. Five large clearings with high ceilings form a "T" shape make up the area, each connected with tunnels. Mushrooms like Common Glowcaps and Spotcaps adorn all surfaces of the cavern. Because of the presence of all the mushrooms, some areas of the cave are quite illuminated, but most are still dim.

Water bodies of varying size can be found throughout the cavern, cooled by the subterranean environment in which they are found. Stick bridges can be used to cross a few pools. The mushrooms form paths to traverse the cavern with, although they can be widened by destroying the fungi. Some tunnels are blocked by Kingcaps and gates, and both can be destroyed to open new paths and access to new areas and foes. Clearings can contain multiple foes and obstacles such as water pools, fire geysers, or electrical wires. There are two separate alcoves with poison bramble gate found on the left of the middle clearing and the bottom of the back-right clearing, and both can be repaired with Yellow Pikmin to open a secret panel within the Overrun Laboratory. The Overrun Laboratory's entrance, a busted blast door, can be found in the back clearing.

Yellow Pikmin are found in the back-right clearing, away from the Skeletal Wollywog. Fungal Grotto's environmental hazard is spores.

Enemies

 * Adapted Blowhog - Two can be found wandering the large chambers, one in the front chamber and the other in the right alcove. Will ignore other signs of life, and the one in the front clearing is ridden by a Mushroom Pikmin, and is flung off upon the Adapted Blowhog bucking its attackers off, whereupon the Mushroom Pikmin will attack.
 * Altered Spectralid - Multiple swarms can be encountered, either by disturbing groups of Common Glowcaps or by walking through certain areas. Some are hostile and attack, and others are docile and flee. Some glow a wide range of neon colors as well, while others are metallic in color and reflect nearby light sources. A hostile swarm is in the left alcove and will emerge when the gate is broken.
 * Baroque Cannon Beetle Larva - Few appear randomly, and typically burrow and flee before they can be attacked. Glitters and shines brightly, even in dim areas. Emits shrill honks when endangered.
 * Crumbling Breadbug - Three wander the area. Two nests are found around the edges of the back-right clearing, and the last of is found on the right edge of the front clearing. Slowly drags objects back to their nests if the objects are close enough. Leaves crumbs behind as it walks that eventually disappear.
 * Infected Pikmin - Always found accompanying Infected Scientists or riding Adapted Blowhogs, and will latch onto the the President and his Pikmin. Commanded by Infected Scientists.
 * Infected Scientist - Few are randomly found wandering Fungal Grotto, usually accompanied by two to five Infected Pikmin. Can be found wandering, sitting down by bodies of water, or engaging hostile forces. Will use any Infected Pikmin at hand, or revert to melee attacks if alone.
 * Kakureimo - Found in several areas of Fungal Grotto. Can be witnessed latching onto the heads of both Infected Pikmin and Mushroom Pikmin. Creeps along the smooth rocks and wet earth of the cavern, usually resulting in sneak attacks.
 * Mushroom Pikmin - Multiple instances are found throughout the entire area. Will engage hostile forces, and mount any nearby Adapted Blowhogs, although it will not control its mount or attack until it is bucked off. Gives off a slight glow of varying colors.
 * Phosbat - Forty-six instances can be found total. Eleven are found around the area, and the remaining thirty-five are found in the back-left clearing. Will shy away from light, but walk slowly through it if forced.
 * Skeletal Wollywog - Three can be found within the area. Two are submerged within pools of water, and the other one is inert in the center of the back-right clearing. Will engage any individual that passes by too closely or bumps into it.
 * Spectral Slurker - Two can be found in the area. One is in the front clearing and can be easily spotted. The other typically wanders the entrance to the Overrun Laboratory, possibly containing the Mushroom Pikmin nearby.
 * Ujadani - Appears in small groups throughout the cavern. Possesses a unique slight luminosity, and can be spotted easily in dark areas.
 * Vampire Bulbear - One instance is found alone in the middle section, and can be easily detected by its eyes and the sound of its footsteps. It circles the pool in the center of the clearing.
 * Puffstool (minor boss) - Found disguised upon the large cluster of Common Glowcaps and Spotcaps in the back clearing, which must be broken through. Springs to life and waddles around the clearing, and sprays spores in an attempt to defend itself, turning any Pikmin caught in the spores into Mushroom Pikmin.
 * Vehemoth Phosbat (major boss) - Fought when the twenty-seven Phosbats in its chamber are defeated. Flies around and swoops down to eat Pikmin, but can be weighted down briefly if enough Pikmin are on it. Occasionally crash-lands the lower its health gets.

Subareas
The Overrun Laboratory is an area that can be accessed by a large busted blast door in the depths of Fungal Grotto in Pikmin: Infection in Progress. The Overrun Laboratory once acted as a scientific research base within the deepest recesses of PNF-404, until its occupants fell victim to the infection. Lining the walls of the laboratory are counters, desks, and shelves. On the counters are beakers and chemical vials, all of which are shattered beakers or expired samples of chemicals. On the desks lie inactive lamps, illegible files, and dried writing utensils. On the shelves there are ruined books that are far too weathered to read. The former occupants, once live and healthy Hocotatians, Koppaites, and Pikmin, are now all but zombified. The laboratory is split up into somewhat of a small labyrinth of rooms. On one of the walls is a steel panel that is pressed subtly into the wall. Two electrodes spread throughout Fungal Grotto can be repaired to access the large chamber behind it, which resides a secret boss, and other humanoid constructs found nowhere else. No friendly Pikmin are found here due to the interior nature of the area.

Overrun Laboratory's environmental hazard is darkness.

Enemies

 * Infected Pikmin - Nineteen scattered throughout. Will cluster behind nearby Infected Scientists, with a maximum of five. Prioritizes Infected Scientists with a smaller group, an example being the two Scientists within close proximity of each other. Has an identical attack pattern to Mushroom Pikmin when initiated into combat without an Infected Scientist to guide them.
 * Infected Scientist - Five scattered throughout the area. Two are in the same room. Will utilize Infected Pikmin if any are following it. If initiated into combat without any usable Infected Pikmin, it will claw at the President to injure him.
 * Mushroom Pikmin - Three scattered throughout the area. Will latch on to allied Pikmin or the President to injure them. Does not revert back into a normal Pikmin, and glows faintly. Ignored by Infected Scientists and Infected Pikmin.
 * Skeletal Wollywog - One disguised as a heap of bone in a dark corner of an uninhabited room. Will animate and initiate combat upon being approached, and will attack any other individual in the laboratory if the President is far enough away.
 * Corrupted Animunculus - Multiple can appear during the secret boss fight against the Awakened Titan. Dives into the President or his Pikmin, but injures itself in the process, and is generally weak. Deactivates and melts into the floor upon the Awakened Titan's defeat.
 * Awakened Titan (boss) - Encountered upon flipping a switch to open the door that closes behind the President and his squad upon entering the secret chamber. Uses a variety of attacks and is resilient, but cannot move and can be crippled if enough damage is done to independent parts. Will open the door to the chamber permanently upon defeat.