- Mary Skelter: Nightmares + 6 DLCs
- Mask of Sanity
- Masquerada: Songs and Shadows – v1.10 GOG DRM-Free
- Masquerade: The Baubles of Doom – v20160501
- Mass Effect – v1.02 + 2 DLCs + Bonus Content
- Mass Effect 2: Digital Deluxe Edition – v1.02 + DLC Bundle (All DLCs)
- Mass Effect 3: Digital Deluxe Edition – v1.05.5427.124 + All DLCs
- Mass Effect: Andromeda – Super Deluxe Edition v1.10 + All DLCs
- Massive Chalice
- Master of Orion: Collector’s Edition + Revenge of Antares + Bonus Content
- Max Payne 3: Complete Edition – v1.0.0.196 + All DLCs
- Max Payne 3: Complete Edition – v1.0.0.216 + All DLCs
- Mechs & Mercs: Black Talons (v1.0.11.24)
- MechWarrior 5: Mercenaries – v1.0.175
- Medieval Engineers – v0.7.2 (Official/Final Release)
- Mega Man 11
- Mega Man X: Legacy Collection 1 + 2
- Mega Man Zero/ZX Legacy Collection
- Megadimension Neptunia VII + Update 2 + 14 DLC, FIXED
- Megadimension Neptunia VIIR + 14 DLCs
- MegaTagmension Blanc + Neptune VS Zombies – Deluxe Edition – v1.01 (Update 1)
- Mekazoo
- Meridian: Squad 22 + Hotfix 2
- Metal Gear Rising: Revengeance + Update 2
- Metal Gear Solid V: Ground Zeroes – v1.0.0.5 + CrackFix
- Metal Gear Solid V: The Phantom Pain – v1.15 + All DLCs
- Metal Gear: Tri-Pack (MG + MGS/VR + MGS2)
- Metal Wolf Chaos XD – v1.02 + DLC
- Metamorphosis
- Metro Redux (2033 + Last Light) – GOG v2.0.0.2 + Update 7
- Metro: Exodus – Gold Edition- v1.0.0.7 + All DLCs + Bonus Content
- Micro Machines: World Series
- Microsoft Flight Simulator – Monkey Repack
- Microsoft Flight Simulator X: Steam Edition v10.0.62615.0
- Middle-Earth: Shadow of Mordor – Game of the Year Edition – v1951.27 + all DLCs
- Middle-earth: Shadow of War – Definitive Edition – v1.21 + All DLCs + 4K Cinematics & HD Texture Packs
- Might & Magic: Heroes VII v1.8 + DLCs
- Mighty No. 9 + 4 DLC
- Million Arthur: Arcana Blood – Limited Edition + Multiplayer
- Minecraft Dungeons – v1.4.3.0_4640940 + 2 DLCs + Multiplayer
- Minecraft: Story Mode – Complete Season (Episodes 1-8)
- Minecraft: Story Mode – Season 2: The Telltale Series – All Episodes (1-5)
- Miniature: The Story Puzzle
- Mining Industry Simulator
- Mirror’s Edge, GOG DRM-Free v1.0.1.0
- Mirror’s Edge: Catalyst – v1.0.3.47248 + 2 DLC
- Moero Chronicle: Deluxe Bundle – v1.0.06
- Monkey King: Hero Is Back – Deluxe Edition + All DLCs
- Monopoly Plus
- Monster Energy Supercross: The Official Videogame