| Arcade Video game |  Marksman Shooting | 1986 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega CD | Marky Mark and The Funky Bunch Model T-4901 | 1992 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mega Drive cart. | Marsupilami Model 1841-50 | 1995 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega ST-V cart. | Maru-Chan de Goo! | 1997 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Saturn CD | Mass Destruction | 1997 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Master System cart. |  Master Games 1 Model 9020 | 1993 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Game Gear cart. | Master of Darkness Model 2437 | 1993 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Master System cart. | Master of Darkness Model 7107 | 1992 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mark III cart. | Masters Golf Model G-1332 | 1987 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Master System cart. | Masters of Combat Model 7124 | 1993 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Gun game | Matchlock | 1972 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Pico game | Math Antics with 101 Dalmatians Model 49047-00 | 1996 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Master System cart. |  Maze Hunter 3-D Model 8003 | 1988 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mark III cart. | Maze Walker Model G-1345 | 1988 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mega Drive cart. | Mazin Saga Model G-4078 | 1993 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mega Drive cart. | Mazin Wars Model 1069-50 | 1993 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mega Play cart. | Mazin Wars Model 11 | 1993 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mega Drive cart. | McDonald's Treasure Land Adventure Model G-4102 | 1993 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Meganet pack. | Medal City | 1991 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Meganet pack. | Mega Anser | 1989 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mega Drive cart. | Mega Bomberman Model 1573-50 | 1994 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mega Drive cart. | Mega Games 2 | 1993 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mega Drive cart. | Mega Games 3 | 1993 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mega Drive cart. | Mega Games 6 Vol. 1 | 1995 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mega Drive cart. | Mega Games 6 Vol. 2 | 1995 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mega Drive cart. | Mega Games 6 Vol. 3 | 1995 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mega Drive cart. | Mega Games I | 1992 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mega-CD | Mega Schwarzschild Model G-6020 | 1993 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Game Gear cart. | Megami Tensei Gaiden - Last Bible S Model G-3427 | 1995 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Game Gear cart. | Megami Tensei Gaiden - Last Bible Model G-3418 | 1994 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Meganet pack. | MegaMind | 1991 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Arcade Video game |  Megumi Rescue | 1987 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mark III cart. | Megumi Rescue Model G-1359 P | 1988 | SEGA Enterprises, Ltd. Tokyo, Japan |
| PC/MS-Windows CD | Memorial Selection Model HCJ-0147 | 1998 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mega Drive cart. | Mercs Model 1119-50 P | 1991 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Master System cart. | Mercs Model 9007 P | 1987 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mega Drive 32X cart. | Metal Head Model 84511-50 | 1995 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Super 32X cart. | Metal Head Model GM-4008 | 1995 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Pico game | Mezase Pro Yakyuu Model HPC-6021 | 1995 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Arcade Video game | Michael Jackson's MoonWalker | 1990 | SEGA Enterprises, Ltd. Tokyo, Japan |
