Valve released Portal 2 in April 2011 as a first person puzzle game with no combat, no health bar and exactly one device: the portal gun. The single player campaign runs nine chapters through Aperture Science, and a separate two player campaign hands ATLAS and P-Body a portal gun each, putting four portals on the field at once. Everything you pick up is a testing element rather than a weapon, from the three paint gels to the Excursion Funnels and Hard Light Bridges.
Portal 2 features distinct areas with increasing difficulty. This guide covers every major location in progression order: what to do, what to get, and when to move on. For the step-by-step path, see our walkthrough.
Area Progression Order
| Order | Location | Difficulty | Key Rewards | Recommended Build |
|---|---|---|---|---|
| 1 | Chapter 1: The Courtesy Call | First 60 to 90 minutes | The portal gun, the basic portal rules, the GLaDOS reboot | P-Body, the co-op turret |
| 2 | Chapter 6: The Fall | Roughly the halfway point | Repulsion Gel, Propulsion Gel, the Cave Johnson and Caroline backstory | P-Body, the co-op turret |
| 3 | Chapter 8: The Itch | Late campaign | Frankenturret puzzles, the setup for the final confrontation | ATLAS, the co-op sphere |
| 4 | Chapter 9: The Part Where He Kills You | Final chapter | The ending, the moon portal, the payoff for everything Conversion Gel taught you | ATLAS, the co-op sphere |
| 5 | Co-op Course 5: Mobility Gels | End of the co-op campaign | Two player gel puzzles, co-op completion, entry into the free Art Therapy course | ATLAS, the co-op sphere |
Chapter 1: The Courtesy Call: Starting Area
The opening. Wheatley wakes Chell in a decayed relaxation vault and walks her through the ruined test track before restarting GLaDOS. It reteaches portals from zero with no time pressure.
| Attribute | Detail |
|---|---|
| Difficulty | First 60 to 90 minutes |
| Key Rewards | The portal gun, the basic portal rules, the GLaDOS reboot |
| Recommended Build | P-Body, the co-op turret |
| Key Equipment | Repulsion Gel |
What to Do Here
- Learn the basics of Portals only stick to white surfaces. This is where you practice without heavy punishment.
- Collect starting resources and your first equipment upgrade.
- Clear all main content before moving to Chapter 6: The Fall.
- If you're struggling, read our beginner's guide.
Chapter 6: The Fall: Early Game
Chell drops into Old Aperture, decades of abandoned test shafts buried under the modern facility and narrated by Cave Johnson recordings. This is where the gels start arriving.
| Attribute | Detail |
|---|---|
| Difficulty | Roughly the halfway point |
| Key Rewards | Repulsion Gel, Propulsion Gel, the Cave Johnson and Caroline backstory |
| Recommended Build | P-Body, the co-op turret |
| Key Equipment | Repulsion Gel |
What to Do Here
- Focus on mastering Momentum carries through portals. It's critical from this point on.
- Farm for Repulsion Gel if you don't have it yet.
- Complete all objectives for maximum rewards.
- Prepare for the difficulty spike in Chapter 8: The Itch.
Chapter 8: The Itch: Mid Game
Wheatley has taken the facility and builds his own test chambers badly, including Frankenturrets assembled from turret and cube parts. The puzzles are simpler and the hazards far less careful.
| Attribute | Detail |
|---|---|
| Difficulty | Late campaign |
| Key Rewards | Frankenturret puzzles, the setup for the final confrontation |
| Recommended Build | ATLAS, the co-op sphere |
| Key Equipment | Repulsion Gel |
What to Do Here
- This is the main skill check. Bring an optimized build.
- Portal Gun becomes accessible here. Prioritize getting it.
- Master The three paint gels for the boss encounters.
- Check our boss guide if you get stuck.
Chapter 9: The Part Where He Kills You: Late Game
The finale against Wheatley, fought with Conversion Gel and his own bombs rather than with any weapon. It ends by putting a portal on the surface of the moon, which conducts portals because it is moon rock.
| Attribute | Detail |
|---|---|
| Difficulty | Final chapter |
| Key Rewards | The ending, the moon portal, the payoff for everything Conversion Gel taught you |
| Recommended Build | ATLAS, the co-op sphere |
| Key Equipment | Portal Gun |
What to Do Here
- Full build optimization is expected by this point.
- Portal Gun should be your primary, fully upgraded.
- Four portals in two player co-op mastery starts mattering here.
- Farm resources for the push into Co-op Course 5: Mobility Gels.
Co-op Course 5: Mobility Gels: Endgame
The last of the five original co-op courses, built entirely around Repulsion and Propulsion Gel for two players at once. It is the hardest part of the base co-op campaign.
| Attribute | Detail |
|---|---|
| Difficulty | End of the co-op campaign |
| Key Rewards | Two player gel puzzles, co-op completion, entry into the free Art Therapy course |
| Recommended Build | ATLAS, the co-op sphere |
| Key Equipment | Portal Gun |
What to Do Here
- This is endgame. Best-in-slot gear and a perfected build are mandatory.
- See our boss guide for endgame fight strategies.
- The reward loop: clear content → upgrade → push harder content.
- Experiment with Funnel and bridge planner for variety once you've mastered the meta.
Exploration Tips
- Clear areas in order: Chapter 1: The Courtesy Call → Chapter 6: The Fall → Chapter 8: The Itch → Chapter 9: The Part Where He Kills You → Co-op Course 5: Mobility Gels. Skipping areas means missing resources you'll need later.
- Check every corner: Hidden caches and secrets are often in non-obvious locations.
- Match your equipment: Some areas favor different equipment types.
- Read the walkthrough: Our walkthrough provides exact progression milestones for each area.
- Don't rush: Clearing an area fully gives more resources than speedrunning two areas.
More Portal 2 Guides
- Portal 2 Portal 2 Overview
- Portal 2 Best Builds
- Portal 2 Tier List
- Portal 2 Walkthrough
- Portal 2 Beginner's Guide
- Portal 2 Tips & Tricks
- Portal 2 Weapons Guide
- Portal 2 Combat Guide
- Portal 2 Boss Guide
- Portal 2 Crafting Guide
- Portal 2 Classes & Characters
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