● 1,061 playing right now on Steam
Steam players say468,312 reviews
99%
Overwhelmingly Positive
One of the best-loved games on Steam.
لا تدعم العربية بعد
InterfaceNo
SubtitlesNo
VoiceNo
Rarest achievementsof 51 · Steam
Still Alive · Complete Course 4 with neither you nor your co-op partner dying2.4%1 in 42
Talent Show · Never lose a cube in Chamber 6 of the Mobility Gels co-op course2.6%1 in 38
Portal Conservation Society · Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements2.8%1 in 36
Triple Crown · Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each3%1 in 33
Party of Three · Find the hidden companion cube in co-op test chamber3.5%1 in 29Steam DeckVerifiedArabicNoControllerFullCo-opYesSplit-screenYesAchievements51
Where players stopshare of players who got each achievement
74%
36.9%
24.4%
5.9%
2.4%
The "Perpetual Testing Initiative" has been expanded to allow you to design co-op puzzles for you and your friends!
By Valve · Metacritic 95
If this is your thingby what players tag them
