Roblox
Details: When you get BC/TBC/OBC, type the code in, in the refferal code place, then you will get 400 robux. Only works if you buy BC/TBC/OBC, if you use gift cards, it won't work because there only is a refferal code place when you buy BC/TBC/OBC.
gog.com
Details: 20% Off Driftmoon Hope Lie In an Unlikely Alliance