Portal 2
Platform / Puzzle / Adventure · 2011 · PlayStation 3, Linux, PC (Microsoft Windows), Mac, Xbox 360, Nintendo Switch
Portal 2 is Valve's first-person puzzle game, released in 2011. You solve test chambers with a portal gun, and the game has a single-player campaign plus a separate two-player co-op campaign. It adds excursion funnels, lasers, light bridges and gels over the first game, and has built-in developer commentary. Nothing in the campaign is permanently lost, because Chapter Select lets you go back for missed achievements.
Guides and missables below stop at this point. Move it forward as you play.
Quest walkthroughs
Quests for Chapter 1: Opening tutorial chambers. Open a quest for step-by-step directions, choices, rewards and troubleshooting. Its full walkthrough reveals that quest’s details.
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Quick tips
Chapter 1: Opening tutorial chambers
Find the portal surfaces
Portals only work on the white panel surfaces, so look for those to find the way to the exit. You can see the whole room before you act.
Chapter 1: Opening tutorial chambers
Scan the room first
Move the camera across the whole room before placing anything. Doing so often shows the solution.
Chapter 1: Opening tutorial chambers
Learn flinging
Flinging builds speed by falling through one portal and exiting another. It is taught in the opening chambers and is used throughout the game.
Things you can miss
Optional quests, items or choices you can lose access to by progressing past a point. Guides often call these “missables”.
Incinerator achievement
Can be lost after: Chapter 1: Opening tutorial chambers
This achievement is story-triggered when you are dropped into the incinerator in Chapter 1. It can be recovered through Chapter Select.
Drop BoxComing up
Can be lost after: Chapter 2: First full test-chamber set
Put a cube on a floor switch without touching it, by pressing the button and redirecting the falling cube with portals. It is in Chapter 2 Test Chamber 6.
Final Transmission and PturretdactylComing up
Can be lost after: Chapter 2: First full test-chamber set
Both come from Chapter 2 Test Chamber 6. The radio comes from trash thrown at you after you press a red button, with portals set up beforehand.
All Portal 2 missables by stage (contains spoilers)
Opening this list shows every missable’s name, including ones past your spoiler line. Names only, no details.
- Incinerator achievement · can be lost after Chapter 1: Opening tutorial chambers
- Drop Box · can be lost after Chapter 2: First full test-chamber set
- Final Transmission and Pturretdactyl · can be lost after Chapter 2: First full test-chamber set
- Optional final test chamber in Chapter 3 · can be lost after Chapter 3: Later chambers
- Good Listener · can be lost after Chapter 4: Escape sequence
- Scanned Alone · can be lost after Chapter 5: Factory and machinery
- No Hard Feelings · can be lost after Chapter 5: Factory and machinery
- Vitrified doors · can be lost after Chapter 5: Factory and machinery
- Potato-related achievement · can be lost after Chapters 6-7: Old facility and gels
- Chapter 7 portrait room item · can be lost after Chapters 6-7: Old facility and gels
- Chapter 8 collectibles · can be lost after Chapter 8: Later test chambers
Guides and data last refreshed Nov 12, 2026. They are generated from web research and may contain mistakes.