I don't believe you can because the maps are only downloadable from the Steam Workshop, not the PS Store. I hope they have a way soon but for right now it is only for PC. If you bought Portal 2 new you should have a redeem code for a free copy of Portal 2 on Steam.
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The PS3 can only get downloads for games from thePlayStationStore. There is no custom maps available at the store so no there is no custom Zombie Maps. It's a PC thing to mod games with unauthorized software not approved by the copyrighted game developer
you can download it on the playstation store along with a few other maps for £7.99
It is not enough to have Zombie Maps they must be designed for the Nintendo Wii not the Xbox 360, PC or PS3 just like the game discs. There are no new maps to download to the Nintendo Wii
No Portal 2 is for PC, Xbox 360 and PS3.
No, Portal is for PC only. Portal 2 is for PS3,Xbox 360,and PC. Plus it would suck on PSP.