To celebrate its second anniversary, Steam has an offer where you can play the Magicka video game for free this weekend -- until January 20, 2013, 1:00 p.m. PST and 3:00 p.m. EST. Unfortunately, if you have a MAC, you will have to either use your PC instead or lament that all games that are available for play on the PC are not simultaneously available for play on the MAC. I tried and received a message to the effect that the game is not playable on the platform I was using. The good news is my Steam visit was not a waste. I had a friend request waiting!
In my opinion, I believe it's time for developers to be more diligent in making games that are playable on the PC also playable on the MAC. Maybe I can start a petition. In the meantime, I guess I will have to use the PC if I want to play this game for free.
Here's more about the free Magicka game that you can play on the PC.