In the dying days of the Sega Mega Drive, future Battlefield and Mirror’s Edge studio DICE made Hardcore, a 2D Metroidvania game.
But Hardcore was never released – its fate sealed in an afternoon meeting at publisher Psygnosis where all Mega Drive projects were dropped, in order to focus on newer hardware.
At the time it was canned, Hardcore had just one bug remaining before it could have been given the green light.
Source: Eurogamer 25 years later, DICE's long-lost Mega Drive game will finally see release