Subtract 1 from the first number in the key (1=0 , 0=9).

Dark Years 8I7N0-47GDM-A6T00
Dark Years 8IDZR-ZC36B-VFZ0E
Dark Fear 976RF-H6YK9-RJBAB
Dark Fear 9A486-0CEYL-RWMKC
Divine Slice of Life 14CYD-N7RAK-AZDAB
Divine Slice of Life 0TI50-9XLNB-0Z4ND
Divine Slice of Life 0TEFN-BJCLF-YMC4V
Divine Slice of Life - Soundtrack 0W0MQ-RBMWK-ZDBB3
DISTRAINT L1747-GZVL7-DAWIK
DISTRAINT J3IBI-AA8VP-ZWNIF
Doctor Watson - The Riddle of the Catacombs 5NLCZ-V6TAF-YEA3M
Doctor Watson - The Riddle of the Catacombs 5NFMZ-K7LV0-T6H6X
Domino Craft VR 6MLI4-552XZ-L49WR
Domino Craft VR 6MNWR-M5A0Q-JX4YK
Don't Let Go! 7ICFX-2P4AX-6F6ZK
Don't Let Go! 7ICLH-LHF3Q-6IHTG
Doorways: Chapters 1 to 3 Collection 8AV5M-JKJJA-4WHL5
DRAGON: A Game About a Dragon 0G4N3-JANRF-K8V0Q
DRAGON: A Game About a Dragon 0G3IC-QEZV8-LY4CY
DRAGON: A Game About a Dragon 0G3TY-E24WZ-P0PAN
Dragonsphere 068EB-LIGYA-MLPP5
Dragonsphere 06BDR-N60WC-9B3K0
Drakensang H4EM7-DBAI0-Y0G40
Drakensang H4E2I-R5C5Q-R85RB
Draw Rider CZVCA-Y9ADV-TN7XP
Draw Rider C0MV3-PTPTD-XZCZR
Dream Chamber 538T4-E55EF-BQTAR
Dream Chamber 539WI-R262Z-QIQXB
Dreamscapes: Nightmare's Heir 4F63Z-LGE8G-2JIRK
Dreamscapes: Nightmare's Heir 4E2W5-V2BZA-6K5H9
Dreamscapes: Nightmare's Heir 4D4DY-FRCBW-F9BNR
Driftwatch VR 72ZLC-9AXW9-N99HD
Driftwatch VR 3KVFC-VZMVM-ZZNTZ
Drones, The Human Condition 6RR4K-48ZWD-TRP7Q
Dub Dash 6ZLHH-DCAFT-GJZ8I
Dub Dash 6ZLD5-J8FTM-G2XRP
Dub Dash 6ZKR8-Q28NH-C5NCV