Valve has launched a massive promotion on its digital distribution service Steam, dubbed ‘The Great Treasure Hunt.’ Running through December 20, those who participate will have a chance at winning 100 Steam games of their choosing.

By completing objectives outlined on the official storefront page, which will be refreshed every 48 hours, you can steadily increase your chances of striking gold.

In addition to giving away 100 games to three grand prize winners, Valve will award 20 Steam users with 5 games from their wishlist during each day of the contest, provided you have completed at least one objective that day. Special Team Fortress 2 hats will also given to those who complete a certain amount of objectives.

To tie-in with objective criteria, select Steam titles will go on sale as well. Currently R.U.S.E., Poker Night at the Inventory, and Chime are available at varying discounts.

Follow this author on Twitter.