Turok 3: Shadow of Oblivion/Walkthrough

Level 1: Seal the Breach
This level begins in a dark city with heavily-armed police having sealed off numerous areas. These police essentially serve as 'walls' blocking the player's progress, since they are immune to all weapons the player should have by that point (they are vulnerable to the PSG) and their weapons are extremely powerful. Danielle receives her grappling hook and uses it to swing across the rooftops, while Joseph gets his Night Vision Goggles to navigate a series of deadly laser beams inside a museum.

The objective of the mission is to reach the top of a skyscraper seen at the beginning where a 'breach' between our world and Oblivion's world has formed; the player is initially prevented from doing so as a gunship crashes through the walkway connecting the two buildings. At the end of the level, a cutscene shows two police gunships flying close to the breach; one is destroyed by giant tentacles while the other is captured and turned into the level's boss. It mutates, having grown tentacles and a large tooth-filled mouth.

Following the defeat of the Oblivion Gunship, Danielle and Joseph head through the portal to the next level.

Level 2: The Military Base
A military base located in the desert (presumed to be Area 51 or something similar). The player encounters military guards bent on stopping their progress. Later, after gaining a corridor keycard, the player encounters a wounded scientist who tells them the self-destruct sequence has been activated and the player must turn it off. When the player arrives underground, they encounter an aquatic lifeform that uses a weak long-range attack. The level's boss is called the Xiphias, a much larger version of the creatures the player encountered in the last few parts.

Level 3: The Lost Land Junkyard
One of the longest levels in the game, the player must traverse the Junkyard to find a portal to the other areas of the Lost Land. The player encounters beings known as "Lost Ones" and most of the level deals with fighting these creatures and re-activating downed equipment to proceed. The boss of this level is called the "Opisthor", a turtle/plesiosaur mutant. This happens to be one of the easiest boss fight in the game. However, you still must fight the Lost Ones during the battle.

Level 4: The Lost Land
The first level from the first Turok game, the enemies and first part of the level are identical to the first game, but instead of going through the teleporter, you fall into an entirely new area. Here you find a new enemy, the Warrior. The player also fights the Warlord, who regenerates each time his health falls. Also, when you come to the pyramid, you enter a whole new area filled with the Fireborn, a lava enemy from Turok 2. You also must fight the Alpha Fireborn for the Fire Gem, so you can combine it with the Ice Gem to enter Oblivion's lair.

Level 5: Oblivion
A mechanical based level similar to the Primagen's Lightship, you fight against the same creatures you fought in the Oblivion Portals in Turok 2. The whole level is a large mining operation, which finds you disrupting said operation. After traversing through each area more than once, you come to a large arena. After a cutscene involving a child transforming into Oblivion, you fight it. After several rounds, Oblivion blows up and you must chase it, fighting Oblivion High Priests along the way. The final boss is Joshua Fireseed who has been possessed by Oblivion.