Unreleased Mega Drive games
From Sega Retro
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Over the course of the Sega Mega Drive's lifetime, a number of games went unreleased:
| Name | Involved Companies | Details |
|---|---|---|
| Beyond Zero Tolerance | Technopop | The sequel to Zero Tolerance. Cancelled when Technopop closed down. The copyright owners eventually released a prototype ROM to the Internet. |
| Explode Star | NCS | The Japanese release of Trampoline Terror!. Cancelled for unknown reasons. Promotional fliers were distributed before the game was cancelled. |
| Speedway Pro Challenge | Renovation Products | The planned American localization of Human's 1991 Mega Drive game Fastest 1. Cancelled for unknown reasons. Box scans exist. |
| Swamp Thing | Microsmiths/Nuvision | Cancelled when Nuvision went under. A prototype ROM circulates around the Internet. |