ウィル デス・トラップII

President of the United States of America receives a letter with simple, but blood-chilling words: within the next twenty-four hours, the entire life on Earth will be annihilated. Specialists track the sender of the letter to a small island named Torinia somewhere in the Pacific Ocean. Special agent Benson is sent there with the ultimate mission: find out who sent the letter, or prepare for the destruction of the world...

[From Moby Games]