| 2021-01-02 | Intro-Demo - Judge Dredd (World, Genesis/Mega Drive) |
| 2021-01-02 | Intro-Demo - Jurassic Park - Rampage Edition (USA, Europe, Genesis/Mega Drive) |
| 2021-01-02 | Intro-Demo - Junker's High (Japan, Mega Drive, Beta) |
| 2021-01-02 | Intro-Demo - Joshua & the Battle of Jericho (USA, Genesis, Unrealished) |
| 2021-01-02 | Intro-Demo - JuJu Densetsu ~ Toki - Going Ape Spit (World, Genesis/Mega Drive) |
| 2021-01-02 | Intro-Demo - Jordan vs Bird (USA, Europe, Genesis/Mega Drive) |
| 2021-01-02 | Intro-Demo - John Madden Football '93 (USA, Europe, Genesis/Mega Drive) |
| 2021-01-02 | Intro-Demo - The Jungle Book (Europe, Mega Drive) |
| 2021-01-01 | Intro-Demo - Joe & Mac (USA, Genesis) |
| 2021-01-01 | Intro-Demo - Jim Power - The Arcade Game (USA, Genesis, Prototipo) |
| 2021-01-01 | Intro-Demo - Joe Montana II Sports Talk Football (World, Genesis/Mega Drive) |
| 2021-01-01 | Intro-Demo - Jiu Ji Ma Jiang II - Ye Yan Bian (China, Mega Drive, Unrealished) |
| 2021-01-01 | Intro-Demo - Jewel Master (USA, Europe, Genesis/Mega Drive) |
| 2021-01-01 | Intro-Demo - Jimmy White's Whirlwind Snooker (Europe, Mega Drive) |
| 2021-01-01 | Intro-Demo - John Madden Football (USA, Europe, Genesis/Mega Drive) |
| 2021-01-01 | Intro-Demo - John Madden Football '92 (USA, Europe, Genesis/Mega Drive) |
| 2021-01-01 | Intro-Demo - Joe Montana Football (World, Genesis/Mega Drive) |
| 2020-12-31 | Intro-Demo - Jashin Draxos (Japan, Korea, Mega Drive) |
| 2020-12-31 | Intro-Demo - Jeopardy! Sports Edition (USA, Genesis) |
| 2020-12-31 | Intro-Demo - Jeopardy! Deluxe Edition (USA, Genesis) |
| 2020-12-31 | Intro-Demo - Jammit (USA, Genesis) |
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