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:
Coupon/voucher has no threshold and appears to work in all region, including the UK, EU, and most Asian regions (including China?) Let everyone know in the comments if it doesn't work in any particular and a certain game.
Obviously certain AAA titles are excluded from this, including Grand Theft Auto V.
To see the discounts in GMG's VIP Sale you'll need to login or create an account.
These titles are SteamPlay Titles and will work for either Mac or PC.
Use coupon PSNEDD-9OF09Q-P4S1MY
These titles activate on the Feral DRM, and are Mac only.
Use Coupon PSNEDD-9OF09Q-P4S1MY
Use Coupon: HAPPYN-EWYEAR-22OFFG
Merge Games Titles
Head Up Titles
More Indie Titles
No threshold (works on games under $7! Works nearly site-wide with a few exceptions like Civilization: Beyond Earth. Coupon does not stack with GMG Credit. Appears to work in all regions.