Shadowgate

Shadowgate is a 1987 point-and-click adventure game developed by ICOM Simulations and published by Mindscape for the Macintosh as part of the MacVenture series. The game takes place in the Castle Shadowgate, residence of the evil Warlock Lord. The player, as the "last of a great line of hero-kings", is tasked with saving the world by defeating the Warlock Lord, who is attempting to summon the demon Behemoth out of Hell.