Update: Unfortunately this promotion has ended early, as they ran out of codes.
Original article: Square Enix and Crystal Dynamics revived the Tomb Raider franchise in 2013 with impressive results. The self-titled reboot received critical acclaim and broke sales records for the series, putting Lara Croft back in the spotlight. If you still haven't picked the game up, you can now take advantage of a special deal while also contributing to a good cause.
Square Enix is currently offering PC codes for Tomb Raider free to anyone who donates at least $1 to Game Changer, a charity that aims to "positively impact the lives of children with life-threatening illnesses through videogames, compassion and innovation." Game Changer has donated over $200,000 to cancer research, while also providing more than 17,000 video games to hospitals and children centers.
You can also enter yourself into drawings for more prizes by donating more. For $20, you're eligible to win a Rise of the Tomb Raider Collector's Edition, a Crystal Dynamics swag bag, and an Xbox One, plus games and accessories. If you donate $50, you'll also receive a "GameChanger Gratitude Package," a Tomb Raider poster (only 25 are available), and entry into all of the $20 drawings.
Source: Game Changer