| Sinclair ZX Spectrum cass. |  Mazeball | 1984 | Wildest Dreams |
| Sinclair ZX Spectrum cass. | Mazecube | 1984 | PAL Soft. |
| Sinclair ZX Spectrum cass. | Mega Fruit Model MF | 1984 | Thor Computer Soft. |
| Sinclair ZX Spectrum cass. | Meltdown | 1984 | Kerian |
| Sinclair ZX Spectrum cass. | Merry Xmas Santa | 1984 | Icon Soft. |
| Sinclair ZX Spectrum cass. | Message from Andromeda | 1984 | Interceptor Soft. |
| Sinclair ZX Spectrum cass. | Metagalactic Llamas - Battle at the Edge of Time | 1984 | Salamander Soft. East Sussex, England |
| Sinclair ZX Spectrum cass. | Meteor | 1984 | Micromania France |
| Sinclair ZX Spectrum cass. | Micro Drivin' | 1984 | Softel |
| Sinclair ZX Spectrum cass. | Micro Maths | 1984 | LCL |
| Sinclair ZX Spectrum cass. | Micro Olympics | 1984 | Database Publications |
| Sinclair ZX Spectrum cass. | MicroHobby Semanal 001-004 | 1984 | Hobby Press Madrid, Spain |
| Sinclair ZX Spectrum cass. | MicroHobby Semanal 005-008 | 1984 | Hobby Press Madrid, Spain |
| Sinclair ZX Spectrum cass. | Micromaze | 1984 | King Soft. |
| Sinclair ZX Spectrum cass. | Microsoftware Magazine No. 5 | 1984 | Infinite Soft. |
| Sinclair ZX Spectrum cass. | Microsoftware Magazine No. 6 | 1984 | Infinite Soft. |
| Sinclair ZX Spectrum cass. | Microsoftware Magazine No. 7 | 1984 | Infinite Soft. |
| Sinclair ZX Spectrum cass. | Microsoftware Magazine Vol. 2 No. 1 | 1984 | Infinite Soft. |
| Sinclair ZX Spectrum cass. | Midrail | 1984 | Dee-Kay Systems |
| Sinclair ZX Spectrum cass. | Millimon | 1984 | Artic Computing, Ltd. |
| Sinclair ZX Spectrum cass. | Millimon + Wally Kong | 1984 | Dixons |
| Sinclair ZX Spectrum cass. | Millionaire | 1984 | Incentive Soft., Ltd. |
| Sinclair ZX Spectrum cass. | Millypede Model KEB 005 | 1984 | Add On Electronics, Ltd. |
| Sinclair ZX Spectrum cass. |  Mind Games | 1984 | Oasis Soft. England |
| Sinclair ZX Spectrum cass. | Mindbender | 1984 | Gilsoft International, Ltd. |
| Sinclair ZX Spectrum cass. | Mission 1 - Project Volcano | 1984 | Mission Soft. |
| Sinclair ZX Spectrum cass. | Mission 2 - Project Gibraltar | 1984 | Mission Soft. |
| Sinclair ZX Spectrum cass. | Mister Mac's Day | 1984 | Arrow |
| Sinclair ZX Spectrum cass. | Money Manager | 1984 | Creative Sparks |
| Sinclair ZX Spectrum cass. | Moon Alert | 1984 | Ocean Soft., Ltd. 13156 |
| Sinclair ZX Spectrum cass. |  Moon Patrol | 1984 | Atarisoft Atari, Inc. |
| Sinclair ZX Spectrum cass. | Moonlight Magic | 1984 | ESP |
| Sinclair ZX Spectrum cass. | Moonlighter | 1984 | Software Supersavers |
| Sinclair ZX Spectrum cass. | Moons of Tantalus Model CS01/84 | 1984 | Cornhill Services |
| Sinclair ZX Spectrum cass. | Mothership | 1984 | Artic Computing, Ltd. |
| Sinclair ZX Spectrum cass. | Mothership | 1984 | Scorpion Soft. |
| Sinclair ZX Spectrum cass. | Motor Mania | 1984 | EMS Soft. |
| Sinclair ZX Spectrum cass. | Motorcycle Crazy | 1984 | Kerian |
| Sinclair ZX Spectrum cass. | Mr T Meets His Match | 1984 | Ebury Soft. UK |
| Sinclair ZX Spectrum cass. | Mr T Tells The Time | 1984 | Ebury Soft. UK |
