To use the free Redbox codes, find a Redbox near you and use the codes or sources below to get your free movie. Visit the Redbox kiosk and enter the promo code during checkout.
Below is a list of Redbox codes that will get you a free movie, all of which are valid as of May 2013. You can only use these codes once per Redbox account.
REDBOX (new customers only)
DVDATWAG (good only at Walgreen's Redbox locations)
WALGREENS (good only at Walgreen's Redbox kiosks)
XQ6R7VDK $.50 Off Rentals
Redbox: Save $.50 Off A Second Disc. Expires 5/3/13.
Some free Redbox codes will get you a free video game rental when you text them to 727272. The code Redbox texts you back is what you'll want to enter at the Redbox kiosk.
Right now there are two free game rental codes: NOWPLAY (expires 5/9/13), and GAMEKIDS (expiration unknown).