The '343 Guilty Spark' mission in Halo: Campaign Evolved presents players with a search for Captain Keyes, alongside the challenge of locating three hidden skulls and one terminal. The mission's dim lighting can make these collectibles difficult to spot, but this guide details their precise locations.

Fog Skull

The Fog skull, which disables the player's motion tracker, is accessible shortly after Master Chief's initial deployment. Proceed forward from the starting area, moving past the crashed Pelican on the left. Continue until encountering enemies and a crashed Covenant dropship. A slope leading upward will be visible to your left. Ascend this slope and move forward until you pass tree roots. Look for two smaller trees on your right, with an unusual plant situated between them. Climb the rocks in this area to find the skull at the summit.

That's Just... Wrong Skull

As players progress deeper into the structure, they will encounter dead Covenant forces, including a side room filled with fallen enemies. Continue towards the objective marker until you find a paranoid marine. This marine will become hostile, but after defeating them, the skull can be found on their body.

The player in Halo: Campaign Evolved looking at the paranoid marine.

Tangent II Terminal

When pursued by the Flood, players will reach a point where the objective marker directs them left. However, a doorway can be found on the right side, positioned between two large wall symbols. Enter this doorway. On the left, players will find several deceased marines with shotguns. Proceed to the other side of the wall directly ahead to discover the Tangent II terminal.

The player in Halo: Campaign Evolved looking at the dead marines with shotguns.

They Come Back Skull

After using a lift to reach the surface, players will escort marines to a defense point until evac arrives. At this juncture, it is necessary to leave the marines and navigate around the large structure near the evac zone. In the dark forest environment, activate your flashlight and search for a plant with green, bulbous sections. Climb the large tree behind this plant, then jump between roots until you find a lengthy, fallen tree adorned with spiky branches. Follow this fallen tree until you observe the skull on the ground to your left, situated on a large rock.

The player in Halo: Campaign Evolved looking at the big structure evac point.