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GMG has a weekend voucher (GMG30-BH67J-TILO5) good for 30% off select titles. The titles are:
BioShock Infinite (Excluding ANZ)
BioShock Infinite Season Pass
Dead Island Riptide
Defiance
Defiance Digital Deluxe Edition
Far Cry 3 Blood Dragon (Europe Only)
Lords of Football
Might & Magic Heroes VI: Complete Edition (Europe Only)
There’s also a 25% off voucher (GMG25-5GT67-87HJ9) good on pre-orders/pre-purchases. Works on:
Battlefield 4 (Europe Only – NA customers can choose between $8 Cash Back or $10 GMG Credit)
Call of Juarez: Gunslinger (Europe Only)
Company of Heroes 2
Dark
GRID 2
Metro Last Light
Remember Me
Resident Evil Revelations
Thunder Wolves
Wargame Airland Battle
99 Spirits
Also, their 20% off voucher (GMG20-GGN5D-FC3NA) is still good on most titles in their store.