Ambiguous Goo

The Ambiguous Goo is a treasure in Pikmin 4. It is actually a used tube of gray acrylic paint. Like other treasures in the Soulful Artist Series, this one is reminiscent of Rock Pikmin. It can be found behind a crystal wall, which are one of the Rock Pikmin's most notable obstacles, is in what is likely the first place players will discover Rock Pikmin, and is located in a dark and cold cave like the Rock Pikmin themselves.

Collecting the treasure
It is lying on the ground in the far eastern side of sublevel 2 of the Kingdom of Beasts. It is blocked by a crystal wall, meaning Rock Pikmin are essentially required to collect this treasure, unless you use bomb rocks instead. To collect this treasure, you must throw 5 Pikmin at it.