A Clog is an obstacle used to block Caves and flood areas. They must be destroyed with Pikmin, usually Blue Pikmin. They are in many areas.
Areas they are in
- Valley of Repose, flooding the way to the area where the Subterranean Complex, Frontier Cavern, Spiny Alien Treat, Fossilized Ursidae, Temporal Mechanism and Unspeakable Wonder are.
- Awakening Wood, flooding the shortcut to Bulblax Kingdom.
- Perplexing Pool, flooding the pond with the Toady Bloyster in it and plugging the entrence to the Shower Room.
- Submerged Castle, plugging the entrances to Sublevels 3,4 and 5.
- Wistful Wild, flooding an area near the Hole of Heroes.
- Dream Den, plugging the entrances to Sublevels 2 and 12.