The Pass:
Guest passes give free access to the full version of this game for a limited time period. Send one to your friend and they can play as much as they like during the free period with no obligation to buy.
Friends:
Select a friend from your friend’s list, or enter an e-mail address for the recipient.
Get Started:
To give out your guest passes, click the button below or select “Manage Guest Passes” from the games menu in your Steam client.