4n. SPIDER CAVE

Destroy Gnawing Lurkers: Find Yellow Eco vents to charge up and shoot the Gnawing Lurkers on the support beams. They are defeated when Green Eco appears. If a Power Cell doesn't appear, check the support beams closely. Another Yellow Eco vent is on the other side of the room. The Power Cell appears on the ground level after all Lurkers are destroyed.

Destroy Dark Eco Crystals: There are five explosive Dark Eco crystals. Get close enough to touch them, then quickly dash away.

• Crystal 1: From the first area, roll-jump across the Dark Eco river to the right, ascend ledges to the Yellow Eco vent. Climb the ledge behind it, use a spiderweb to reach a higher ledge. Use another spiderweb to cross platforms to a precipice. Hop across moving Precursor platforms to the crystal's platform. Touch the crystal and take refuge.

Crystal 2: From the previous location, use Precursor platforms to reach ledges on the far wall. Enter a tunnel between a Yellow Eco vent and a support beam, leading to a Dark Eco lake. Use platforms to reach the crystal on the ledge above, or charge up at the Yellow Eco vent and blast it from afar.

Crystal 3: Cross the lake using Precursor platforms. Hop onto the right ledge on the far side. Roll-jump over a Dark Eco pit to find water. Dive into the pool to find the crystal at the bottom, then quickly return to the surface.

Crystal 4: Go back slightly and hop onto the other ledge by the Dark Eco lake. Follow it to find a light crystal. Smack it to illuminate the cave. Run between light crystals to brighten the area. At the fourth light crystal, there is a pool of water. Dive in to find another Dark Eco crystal.

Crystal 5: From the Spider Cave entrance, take a left. Bounce on spiderwebs to cross a river, then follow the path under a wooden bridge into a smaller cavern with two metal boxes. You'll find another Dark Eco river; the crystal is to the right. Roll-jump over the goo to reach it.

Explore the Dark Cave: A dark cavern is located at the back of the first area, past the Dark Eco lake. Smack the first light crystal at its entrance to temporarily brighten the chamber. Hop over a gap to the second light crystal. Stick to the left and head for a wooden bridge. Leap over a small gap to find a third light crystal embedded in the wall. Smack a small spider enemy, then crouch-jump to a high ledge with loose planks; leap over them. At the end of the bridge, a larger spider with fireballs guards the next light crystal. Jump onto the platform above and follow.