Where the challenge is: systems — knowing how it works.
How hard is Portal?
Where the challenge is: systems — knowing how it works. You get through it by working out what the game is actually doing and coming back with a better build or a better plan, not by faster hands.
Finishing it
Portal has an ending, but nothing in its achievement list marks it clearly enough to trust — so there's no finish rate to show.
Rarest achievements
Published rarity by platform.
Steam
Basic ScienceEarn bronze medals on all Portal challenges.2.8%
Aperture ScienceEarn gold medals on all Portal challenges.2.8%
Rocket ScienceEarn silver medals on all Portal challenges.2.8%
Camera ShyDetach security cameras from the walls.4.1%
Transmission Received..?4.4%
Played Portal? See how many of these you've got.
- Which ones you've earned — and which you're missing
- Your rarest unlock, and where it ranks
- Your whole history for this game, on one timeline
- Steam, PlayStation, Xbox and Battle.net in one place
Free. Takes about a minute.
About Portal
Portal™ is a new single player game from Valve. Set in the mysterious Aperture Science Laboratories, Portal has been called one of the most innovative new games on the horizon and will offer gamers hours of unique gameplay.
How rarity is calculated
Each platform calculates rarity from its own player population. These percentages are shown side by side but are not a controlled comparison.
- Steam — Valve's published global unlock percentage across Steam owners of the game.
Percentages are shown exactly as each platform publishes them. Pyroblast does not recalculate them and does not mix player populations together. Data updated .