Redbox movie matchup game every day to earn points.

Once you reach each of these levels of points you’ll get 1, 2, or 3 free Redbox rentals:

RUBY: 10,000 points or more (awarded 3 promo codes)
GOLD: 7,500 points or more (awarded 2 promo codes)
SILVER: 5,000 points or more (awarded 1 promo code)

In addition, you can also earn points by joining their text club, email list, sharing, and inviting friends.