Ignore the first and last character of these keys...

Garfield Kart 746RI7-N98XJ-2G2F32
Garfield Kart K46M0K-6BFXM-XBZTPX
Garfield Kart 646P36-JC4TT-YYIBCY
Grim Dragons Z4B4XZ-H0GEN-WRZ5JW
Grim Dragons H4B3ZH-GBY22-JNNWEJ
Groggers! W8AZ2W-RCHR2-V8MWLV
Groggers! H80H2H-XWCVH-7FLRK7
Grotesque Tactics: Evil Heroes J2NZZJ-VHGC4-8ALHV8
Grotesque Tactics: Evil Heroes D0JCDD-CYRFD-GRJVZG
Grotesque Tactics 2: Dungeons & Donuts A5X2NA-RVC5P-4MQNV4
GrottyScape E4CQ8E-DFWW0-0EQZ60
GrottyScape H4CHHH-247NX-NTPMZN
Ground Breakers L0DQDL-QNMQ8-6XGGX6
gShift LBKDYL-V50K3-993GI9
gShift QBK85Q-NZQ8C-XRWFIX
gShift WBKIRW-53GBD-C9ZTQC
The guard of dungeon L9EA3L-9ZFH9-J06D2J
Guardian war VR R6ZW3R-NHYRY-74AX07
Guardian war VR 46ZTG4-03HC3-AQ2HBA
Guilty Gear X2 #Reload W89T4W-7QVZD-R9RYQR
Gun Rocket G4M8EG-2M9BL-NVHGXN
Gun Rocket G4MBTG-06XTF-02H700
Gun Rocket 245832-QZI90-WNDMGW
GundeadliGne V78TLV-ZW3ER-WF055W
GundeadliGne X78ZKX-JI9CI-BJ0B9B
Gundemonium Recollection 878DT8-CTBRJ-T55IXT
Gundemonium Recollection Q78H4Q-MPLB2-708MF7
Gun Done B8EHJB-CYWXH-4Z8B74
Gunship! FBLJIF-63XCP-LDX22L
Gunman Clive A7YNQA-74X2Y-J4BD7J
Gunman Clive I7YLGI-RXWEC-ZZAFRZ
Gunman Clive 2 47Y9M4-AILGI-38QDK3
Gunman Clive 2 F7Y9ZF-B5Y4C-AYEDBA
Gunnheim 93NQC9-RTMET-50X025
Gunnheim 03N3V0-EZ7NJ-ENBZNE
Gyromancer YLA86Y-ALD6Q-ZAL4FZ
Gyromancer 2CR4R2-CX823-RF6MRR