Secret Agent: Mission One

Robert H. Melton, famed weapons physicist has designed the Energy Synchronizer, a device for concentrating high amounts of energy at specific coordinates, with atomic device like-power. He has moved to the coast off a little-known area named Batangali, and now demands to be made ruler of the world, or within 48 hours will begin to destroy the world's great cities. As a Secret Agent, you must infiltrate his island stronghold and de-activate the automatic firing device, which will cause the Energy Synchronizer to activate if his island is attacked. - MobyGames