To see the discounts in GMG's VIP Sale you'll need to login or create an account.
Coupon/voucher will work site wide on most titles.
Note: Coupons/Voucher codes require you to have a valid address on your GMG account in order to work.
This 20% coupon works on some deals that the 22% voucher will not work on like PayDay 2 and Pillars of Eternity.
Coupon/voucher works on most title sitewide and should stack with new Black Friday sales. Works in all region, including the UK, EU, and most Asian regions.
For our fellow Steam gamers visiting from abroad who doesn't want to fiddle with robot translation:
24 Hour Deals starting 4/23/15