You'd think universal praise would be good enough to sell Portal 2, but apparently it's just not enough for Valve. The company has dropped the PC and Mac versions of the humorous puzzler down to a wallet-friendly $30. You can even pack in the original Portal – Joystiq's favorite game of 2007 – for another five bucks.
Don't just buy it for yourself. Buy it for science.
Portal 2 is the sequel to 2007's Game of the Year and draws from the award-winning formula of innovative gameplay, story, and music that earned the original over 70 industry accolades. Features single and multiplayer co-op modes.