Yes it is. You need the Steam application to download it.
It will be on Mac the day Portal 2 is released.
no pc and mac only
You can buy Portal from Steam. Portal was free on many occasions but it is currently a paid product.
Buy it through steam.
A wide variety of games, available from the Mac's built in App Store, Steam and numerous other sources can be played on a Mac. Current popular games include Assassins Creed, Portal 2, Civilization V, Iron Marauders etc. etc.
Portal is not currently available on any emulated systems.
PC, PS3, XBOX 360, Mac,
ps3, Xbox 360, PC/MAC
No. Portal 2 is available on XBOX 360, PS3 and PC only.
If you want to play the game on a PC or a Mac, yes.
No, they just make it for PS3, XBOX 360 and PC/MAC.
Portal 2 requires an up to date version of Snow Leopard. The requirements are:OS: MAC OS X 10.6.7 or higherProcessor: Intel Core Duo Processor (2GHz or better)Memory: 2GB