Portal
Platform / Puzzle / Adventure · 2007 · PlayStation 3, Linux, Android, PC (Microsoft Windows), Mac, Xbox 360, Nintendo Switch
A first-person puzzle game in which you play Chell, forced through tests in the Aperture Science Enrichment Center by the malicious AI GLaDOS. You solve each chamber with a portal gun that links two openings. It is single-player only with a single ending.
Guides and missables below stop at this point. Move it forward as you play.
Quest walkthroughs
Quests for Opening 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
Opening chambers
Know your portal surfaces
Portals only go on light, flat panels. Dark or metal surfaces will not take them.
Opening chambers
Look before you step
Look through a portal before you step in to check your landing.
Opening chambers
Momentum carries through portals
Falling into one portal and exiting another keeps your speed. This is the basis of every later fling puzzle.
Opening chambers
Portal moving objects too
Objects in motion can pass through portals as well, which you can use to move them where you can't reach.
Opening chambers
Skip hidden items on a blind run
Radios and cameras start appearing early. Skip them on a first blind run unless you are going for achievements.
Opening chambers
Controller aim settings
On Switch, PS3 and Xbox 360, adjust aim sensitivity and use a gyro option where available.
Things you can miss
Optional quests, items or choices you can lose access to by progressing past a point. Guides often call these “missables”.
Chamber 01 radio
Can be lost after: Opening chambers
Walk past the Hazard Board without dropping into the first room, then look toward a camera on your right to find the radio. It is missed if you drop in first, and you must replay Chamber 01 to get it.
All Portal missables by stage (contains spoilers)
Opening this list shows every missable’s name, including ones past your spoiler line. Names only, no details.
- Chamber 01 radio · can be lost after Opening chambers
- Radios and cameras off the main route · can be lost after Advanced puzzles and hidden rooms
- Chamber 16-18 dens · can be lost after Advanced puzzles and hidden rooms
- Chamber 19 railing radio · can be lost after Final chamber and escape
- Chamber 19 back-room dens · can be lost after Final chamber and escape
Guides and data last refreshed Nov 14, 2026. They are generated from web research and may contain mistakes.