| Mortimer Beckett and the Crimson Thief (2012) | 49,538 | 77 |
| Mortimer Beckett and the Lost King (2010) | 207,793 | 61 |
| Mortimer Beckett and the Secrets of the Spooky Manor (2007) | 0 | 0 |
| Mortimer Beckett and the Time Paradox (2008) | 92,898 | 91 |
| The Mortuary Assistant (2022) | 379,835,149 | 37,467 |
| Mortui: Outbreak Secrets (2024) | 6,333 | 44 |
| Mortville Manor (1986) | 50,196 | 71 |
| Mortyr (1999) | 2,570,779 | 410 |
| Mortyr II (2005) | 394,548 | 197 |
| Mos Speedrun (2011) | 16,731 | 33 |
| Mosaic (2019) | 4,779,865 | 1,847 |
| Mosaic Chronicles (2022) | 14,151 | 63 |
| Mosaic: Game of Gods (2016) | 0 | 0 |
| Mosaic: Game of Gods II (2018) | 8,882 | 7 |
| Mosaic: Tomb of Mystery (2006) | 5,284 | 15 |
| Mosaique Neko Waifus 2 (2020) | 13,190 | 17 |
| Mosaique Neko Waifus 3 (2020) | 7,449 | 17 |
| Mosaique Neko Waifus 4 (2021) | 30,461 | 21 |
| Mosaique Neko Waifus 5 (2022) | 4,277 | 16 |
| Mosby's Confederacy (2008) | 15,020 | 6 |
| Moscow Racer (2009) | 824,730 | 38 |
| Moscow to Berlin: Red Siege (2006) | 12,932 | 32 |
| Moshcave (2022) | 99 | 4 |
| Moshi Monsters (2008) | 19,373,495 | 1,133 |
| Moshi Monsters: Katsuma Unleashed (2013) | 89,198 | 22 |
| Moshi Monsters: Moshling Zoo (2011) | 290,572 | 63 |
| Moshi Monsters: Moshlings Theme Park (2012) | 113,865 | 48 |
| Moskow 2024 (2000) | 1,002 | 2 |
| Moss (2018) | 16,992,683 | 3,652 |
| Moss Destruction (2019) | 32,546 | 172 |
| Moss: Book II (2022) | 1,613,963 | 1,235 |
| Mossen Seikkailut (2020) | 39 | 1 |
| Mossfield Origins (2024) | 8,421 | 11 |
| Mossroot (2024) | 18,717 | 8 |
| Mossy Pixels (2023) | 0 | 0 |
| The Most Lecherous (2023) | 0 | 0 |
| MOT (1989) | 9,335,979 | 512 |
| MOTAS (2001) | 2,479,400 | 160 |
| Motel Manager Simulator (2024) | 57,167,046 | 4,790 |
| Moth Planet (2024) | 2,205 | 10 |
| Mother 1+2 (2003) | 1,352,426 | 953 |
| Mother 3 (2006) | 105,155,715 | 27,484 |
| Mother Ghoul - The Curse of Unborns (2023) | 2,114 | 31 |
| Mother Hub (2025) | 139,073 | 146 |
| Mother Russia Bleeds (2016) | 13,528,938 | 3,691 |
| Mother Simulator (2018) | 565,098,981 | 4,963 |
| Motherboard Under Attack (2022) | 9,735 | 161 |
| MOTHERGUNSHIP (2018) | 4,618,649 | 2,575 |
| MOTHERGUNSHIP + Tower of Guns (2018) | 382 | 2 |
| Motherless - Season 1 (2022) | 0 | 0 |
| MotherLoad (2004) | 10,754,317 | 312 |
| Mothers and Daughters (2024) | 52,540 | 15 |
| Mothlight (2017) | 0 | 0 |
| Mothmen 1966 (2022) | 79,938 | 299 |
| Motif (2017) | 382 | 3 |
| MotionSports (2010) | 2,268,741 | 63 |
| MotionSports Adrenaline (2011) | 522,402 | 97 |
| Motivational Hero (2021) | 35 | 1 |
| Motivational Hero Vol. 2 (2021) | 34 | 1 |
| Moto Chaser (2008) | 5,674 | 3 |
| Moto Extreme (1997) | 141,007 | 30 |
| Moto Knight (2024) | 52 | 1 |
| Moto Offroad Simulator (2022) | 556 | 4 |
| Moto Parkour (2024) | 96 | 3 |
| Moto Pizza Courier (2022) | 500 | 11 |
| Moto Racer (1997) | 43,949,393 | 1,609 |
| Moto Racer 2 (1998) | 1,275,552 | 620 |
| Moto Racer 3 (2001) | 1,117,312 | 242 |
| Moto Racer 4 (2016) | 3,324,249 | 2,997 |
| Moto Racer Advance (2002) | 114,607 | 237 |
| Moto Racer DS (2008) | 54,779 | 108 |
| Moto Racer World Tour (2000) | 219,314 | 128 |
| Moto Rider GO: Highway Traffic (2016) | 7,687,125 | 1,056 |
| Moto Roader (1989) | 221,685 | 158 |
| Moto Roader II (1991) | 13,050 | 25 |
