To celebrate the launch of thier Steam platform on Mac, Valve is giving away the game Portal (that runs on both Mac and PC) for free! But hurry, they are only giving it away until 5/24/2010. If you already have a Steam account, you can get the game directly from the store. If you don't already have a Steam account, you can get the game you can access it here.
If you are not familiar with Portal, here is a description from the SteamPowered website:
Portal™ is a new single player game from Valve. Set in the mysterious Aperture Science Laboratories, Portal has been called one of the most innovative new games on the horizon and will offer gamers hours of unique gameplay.
The game is designed to change the way players approach, manipulate, and surmise the possibilities in a given environment; similar to how Half-Life® 2's Gravity Gun innovated new ways to leverage an object in any given situation.
Players must solve physical puzzles and challenges by opening portals to maneuvering objects, and themselves, through space.
