Know someone who plays Rainbow Six Siege on PC? If you’re really nice to them, they can get you in for free this weekend through Ubisoft Montreal’s new Friend Referral Program.

As of today, PC users who own the game can snag four referral codes at rainbow6keys.ubi.com to give to four friends. Those friends can then download and play Rainbow Six Siege for free until 9:01AM PST / 12:01PM EST on Monday, December 21. Referrers get a 24-hour Renown Boost once the program ends.

In addition, anyone who visits that link and clicks “Buy Now With 25% Discount” will be taken to the Uplay Shop where they’ll find either the Standard or Gold Edition of the game for 25% off. Any progression made during the free weekend will also carry over.

It’s a pretty good deal and we recommend taking part if you know someone who plays on PC. Our review for Rainbow Six Siege was largely positive, praising its finely-tuned multiplayer and intense firefights.