Hey yea the coupons should work until 24th of september :) if you have any problems you can write to them at support@bitgaming.org! :) There are some indie titles there for like 3-5 euro, so one coupon could give a free game without adding anything :)
Just write the code in you're cart when you're checking out!
Yea come on now Bungie!
RE: Free Steemit Exclusive $10 Coupon Give-Away for Steam Game Keys