Requires Humble Bundle newsletter subscription. If you're not already subscribed, claiming the game will subscribe you to their newsletter.
Provided as a Steam key. Unclaimed keys will be removed from your Humble account on 28/12 at 7AM NZDT.
About LEGO: Lord of the Rings:
Based on The Lord of the Rings motion picture trilogy, LEGO® The Lord of the Rings follows the original story-lines of The Lord of the Rings: The Fellowship of the Ring, The Lord of the Rings: The Two Towers, and The Lord of the Rings: The Return of the King, taking players through the epic story events re-imagined with the humor and endless variety of LEGO play.
Says you have to use by 27 Dec 10am.