A non-portalable surface is a wall, ceiling, or floor that you can put portals onto by using the Aperture Science Handheld Portal Device or the Aperture Science Quantum Tunneling Device. It appears in many games from Valve (some legit, some obtained using mods, and some impossible to obtain), like Half-Life 2 and Portal.
I couldn't put the exit portal, because it was a non-portalable surface! You don't even know what the white gel is made of! I have got to seriously quit co-op.
by layo the layo February 5, 2026
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