Humble Bundle is currently giving away the game Shadow Warrior: Special Edition completely free on their store, so follow the link and grab the game!
You only have 2 days to get it, so you better do it sooner rather than later, or else you might have to pay for it if you want to play it.
The free game is actually a Steam code, so you can attach it to your Steam account and download and install the game from there. It has trading cards, so you can even make some free money from playing it and selling the cards on the trading market.