| Title | Games |
 | Mad Doc Software LLC
Lawrence, MA | 1 |
| | MadCat Interactive
Location Unknown | 0 |
| | Magenta Software Ltd.
Albert Dock, Liverpool, UK | 0 |
| | Mass Media
Moorpark, CA | 1 |
| | Massive Entertianment
Sweden | 0 |
| | Mattel Interactive
El Segundo, California | 0 |
| | Maxis Studios
Emeryville, California | 1 |
| | Media Vision
Japan | 0 |
| | MercurySteam
Spain | 4 |
| | Metro 3D
Location Unknown | 0 |
| | Metropolis Software
Poland | 2 |
| | Microids
Global | 0 |
| | Microsoft
Redmond, Washington | 64 |
| | Microsoft Game Studios Japan
Japan | 4 |
| | Midway Entertainment
Location Unknown | 6 |
| | Midway Studios Austin
Austin, TX | 1 |
| | MIG Entertainment
Location Unknown | 0 |
| | Milestone
Location Unknown | 18 |
| | Mindware
Czech Republic | 2 |
| | Mithis
Location Unknown | 0 |
| | MixMax
Location Unknown | 0 |
| | Monolith Productions
Location Unknown | 9 |
| | Monster Games
Location Unknown | 0 |
| | Monster Games
Hamburg, Germany | 0 |
| | Mucky Foot Productions
Surrey, UK | 0 |
| | Mistwalker
Location Unknown | 2 |
| | MumboJumbo LLC
Location Unknown | 1 |
| | Majesco
Location Unknown | 1 |
| | MTV Games
Location Unknown | 0 |
| | Mine Loader Software
Location Unknown | 1 |
| | Mondo Media
Location Unknown | 3 |
| | Marvelous Interactive
Location Unknown | 1 |
| | MAXUM Games
Location Unknown | 1 |
| | Midway Studios Chicago
Location Unknown | 1 |
| | Masterpiece
Location Unknown | 1 |
| | Merscom LLC
Location Unknown | 1 |
| | Monsune Moon
Location Unknown | 2 |
| | Metacreature Games
Location Unknown | 0 |
| | Mo
Location Unknown | 1 |
| | Mommy's Best Games
Location Unknown | 5 |
| | Mere Mortals
Location Unknown | 1 |
| | Metropolis Soft.
Location Unknown | 1 |
| | Moss Ltd.
Location Unknown | 3 |
| | Monumental Games
Location Unknown | 2 |
| | Mexond
Location Unknown | 2 |
| | Madcat327
Location Unknown | 1 |
| | Mana Bomb Game Studios
Location Unknown | 1 |
| | m00nkeh
Location Unknown | 1 |
| | Mindscape
Location Unknown | 1 |
| | Microsoft Research
Location Unknown | 1 |
| | Most Wanted
Location Unknown | 1 |
| | Monkeypaw Games
Location Unknown | 1 |
| | Mojang AB
Location Unknown | 0 |
| | Mastiff
Location Unknown | 2 |
| | Mad Catz
Location Unknown | 1 |
| | Miniclip
Location Unknown | 10 |
| | M2
Location Unknown | 5 |
| | Mando Productions
Location Unknown | 1 |
| | Mossmouth
Location Unknown | 1 |
| | Moon Spider Studio
Location Unknown | 1 |
| | Maximum Games
Location Unknown | 1 |
| | Might and Delight
Location Unknown | 1 |
| | MaxNick
Location Unknown | 1 |
| | Merge Interactive
Location Unknown | 3 |
| | Mokus
Location Unknown | 1 |
| | Marker Metro
Location Unknown | 2 |
| | Monkey Bar Games
Location Unknown | 1 |
| | MachineGames
Location Unknown | 1 |
| | Mighty Rocket Studio
Location Unknown | 1 |
| | Magic Pockets
Location Unknown | 1 |
| | Mediatonic
Location Unknown | 1 |
| | MLB
Location Unknown | 1 |
| | Microsoft Studios
Location Unknown | 1 |
| | Mouldy Toof
Location Unknown | 1 |
|
HQ Network: 8,892 | 
Guests: 4844 |
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