From its Wikipedia entry:
On the Mega Drive/Genesis, Game Gear and Sega Master System a side scrolling platformer action game titled Jurassic Park was developed by BlueSky Software. This game can be played in two modes, either as Dr. Alan Grant or as a Velociraptor. Playing as each provides the user with an alternative story and level design.
The climax of the game mirrored the unused climax of the film, in which Grant must defeat a pair of Velociraptors by causing the Tyrannosaurus rex skeleton in the Visitors Center to collapse on top of them. Grant himself is the final boss in the same location for the raptor storyline: your dinosaur character must cause the bone structure to collapse via certainly placed kicks to cause Grant to flee.