8 Eyes was a game released by Seta Corporation in 1988 for the Nintendo Entertainment System.

The world of 8 Eyes is post-apocalyptic Earth. Mankind is recovering from hundreds of years of chaos and nuclear war, and civilization is being rebuilt by the Great King, who harnesses the power of the 8 Eyes.

The 8 Eyes are jewels which were formed at the "eyes", or centers, of the eight nuclear explosions which came close to destroying the Earth. The 8 Eyes have mysterious power which, in the wrong hands, could bring about the end of the world. The Great King's eight power-hungry Dukes steal the jewels for themselves and banish the King to the nuclear wastelands, threatening to once again plunge the Earth into war.

The player takes control of Orin the Falconer, and his fighting falcon Cutrus. His mission is to penetrate the Dukes' eight castles and retrieve the 8 Eyes. With the help of Cutrus, you must fight the Dukes' soldiers, nuclear mutants, and the Boss of each castle to get the jewels back. After the jewels have been regained, you must return them to the Altar of Peace so that the Great King may return and finish the rebuilding of Earth.

Because of the sub-weapon system, it is often compared with Castlevania, and in fact, Orin does look something like Simon Belmont.