| Atari 2600 cart. |  Master Builder Model SA-210 | 1983 | SVI SpectraVideo, Inc. |
| Atari 2600 cart. | Masters of the Universe - The Power of He-Man Model MT4319 | 1983 | M Network Mattel Electronics Hawthorne, California, USA |
| Atari 2600 cart. | Math Gran Prix Model 49-75128 | 1982 | Sears Chicago, IL, USA |
| Atari 2600 cart. |  Math Gran Prix Model CX2658P | 1982 | Atari, Inc. CA, USA |
| Atari 2600 cart. | Math Gran Prix Model CX2658 | 1982 | Atari, Inc. CA, USA |
| Atari 2600 cart. | Math Model 99808 | 1977 | Sears Chicago, IL, USA |
| Atari 2600 cart. | Maze Craze | 19?? | Unknown |
| Atari 2600 cart. | Maze Craze - A Game of Cops 'n Robbers Model CX2635P | 1978 | Atari, Inc. CA, USA |
| Atari 2600 cart. | Maze Craze - A Game of Cops 'n Robbers Model CX2635 | 1978 | Atari, Inc. CA, USA |
| Atari 2600 cart. | Maze Mania - A Game of Cops 'n Robbers Model 49-75157 | 1980 | Sears Chicago, IL, USA |
| Atari 2600 cart. | Maze Model 49-75112 | 1978 | Sears Chicago, IL, USA |
| Atari 2600 cart. |  McDonald's - Golden Arches Adventure | 1983 | Parker Bros. Beverly, MA, USA |
| Atari 2600 cart. | Medieval Mayhem Hb | 2006 | SpiceWare |
| Atari 2600 cart. | Mega Force Model 11005 | 1982 | Fox Video Games, Inc. 20th Century Fox Santa Clara, CA, USA |
| Atari 2600 cart. | Mega Force PAL Model 1105 | 1982 | Fox Video Games, Inc. 20th Century Fox Santa Clara, CA, USA |
| Atari 2600 cart. |  Mega Funpak | 19?? | HES Human Engineered Soft. |
| Atari 2600 cart. | MegaBoy | 19?? | Dynacom Sao Paulo, Brazil |
| Atari 2600 cart. | MegaMania | 19?? | Unknown |
| Atari 2600 cart. | Megamania | 1983 | Digitel |
| Atari 2600 cart. | Megamania | 1982 | Dynacom Sao Paulo, Brazil |
| Atari 2600 cart. | MegaMania | 1982 | Polyvox Brazil |
| Atari 2600 cart. | MegaMania - A Space Nightmare Model AX-017 | 1982 | Activision, Inc. Mountain View, CA, USA 47875 |
| Atari 2600 cart. | Megamania Model C-829 | 1983 | CCE Soft. Brazil |
| Atari 2600 cart. | MegaMania Model EAX-017 | 1982 | Activision, Inc. Mountain View, CA, USA 47875 |
| Atari 2600 cart. | Mein Weg - My Way Model 686.561 2 | 1983 | Quelle |
| Atari 2600 cart. | Meltdown Model 11029 | 1983 | Fox Video Games, Inc. 20th Century Fox Santa Clara, CA, USA |
| Atari 2600 cart. | Memory Match Model 6-99814 | 1978 | Sears Chicago, IL, USA |
| Atari 2600 cart. | Meteor Defense Model 554-33 391 | 1983 | ITT Family Games |
| Atari 2600 cart. | Mid-Time Model SS-018 | 1983 | Suntek |
| Atari 2600 cart. | Midnight Magic Model CX26129 | 1986 | Atari Corp. CA, USA |
| Atari 2600 cart. | Mighty Mouse | 19?? | Funvision |
| Atari 2600 cart. | Millipede Model CX26118P | 1984 | Atari, Inc. CA, USA |
| Atari 2600 cart. | Millipede Model CX26118 P | 1984 | Atari, Inc. CA, USA |
| Atari 2600 cart. | Mind Maze | 1984 | Atari, Inc. CA, USA |
| Atari 2600 cart. | Miner 2049er Vol. II Model 7-011 | 1983 | Tigervision Tiger Electronic Toys, Inc. Orchard Mundelein, IL, USA |
| Atari 2600 cart. | Miner 2049er Vol. II PAL Model 7-011 | 1983 | Tigervision Tiger Electronic Toys, Inc. Orchard Mundelein, IL, USA |
| Atari 2600 cart. | Miner 2049er Model 7-008 | 1983 | Tigervision Tiger Electronic Toys, Inc. Orchard Mundelein, IL, USA |
| Atari 2600 cart. | Miner 2049er PAL Model 7-008 | 1983 | Tigervision Tiger Electronic Toys, Inc. Orchard Mundelein, IL, USA |
| Atari 2600 cart. | Mines of Minos Model CM005 | 1982 | CommaVid, Inc. Aurora, IL, USA |
| Atari 2600 cart. | Mines of Minos PAL Model CM-005 | 1982 | CommaVid, Inc. Aurora, IL, USA |
