Yellow goo



Goo is a viscous, yellow substance encountered in Metroid: Samus Returns. It is present on walls and ceilings throughout SR388 as an obstacle for Samus. If she is ascending a wall or ceiling with the Spider Ball, she will instantly slip off on contact. The goo is often present in large cavernous rooms or in chambers where Metroids are battled, such as the room where Samus encounters the first Zeta Metroid. Samus will have to work around walls covered in goo using the Space Jump, Spider Boost or Turbo Bomb, as there is no upgrade or method to circumvent goo-covered walls otherwise.

A predecessor of sorts existed in Area 3 of the original Metroid II: Return of Samus. They were referred to as "restraining Metroid webs" in Nintendo Power. They also prevent ascension with the Spider Ball, but unlike the goo in Samus Returns, these webs are corrosive.