8 Eyes is an Action Game developed by Thinking Rabbit, published by Seta Corporation in Japan in 1988, and by Taxan Corporation in North America in 1990.
The story takes place in the aftermath of a nuclear war. After a Great King helped rebuild the world with the power of mysterious jewels he called the 8 Eyes, his generals turned against him and stole the gems for themselves, banishing him to the nuclear wastes before he could complete his duty. It now lies upon Orin, a swordsman and falconer, to fight through each of the generals' castles and defeat the strange creatures and soldiers within in order to retrieve the gems and help the Great King complete his mission.
- Affably Evil/Graceful Loser: The dukes all share tea with you after being defeated and surrendering their gem.
- All There in the Manual: You'd only know the setting is supposed to be in the post-apocalyptic future by reading the manual. In-game, the aesthetics borrow a great deal from the original Castlevania, and as a result the setting looks vaguely 17th-century.
- Asymmetric Multiplayer: In 2-player mode, one player plays as Orin, and the other plays as Cutrus. The player playing Cutrus can fly freely around the screen to attack enemies, whereas in 1-player mode, he can only fly horizontally once released.
- Attack Animal: Orin can use his falcon, Cutrus, to attack enemies he can't normally hit, or to uncover secret blocks he can't normally reach.
- An Axe to Grind: The boss of the Africa house uses an axe, which he occasionally throws at you.
- Bag of Spilling: Any power-ups you earn are not retained between levels.
- Boss Rush: The House of Ruth features rematches against six of the seven Dukes from the earlier stages before fighting Lady Ruth herself.
- Death Dealer: The boss of the Italy house specializes in razor-sharp playing cards.
- Dem Bones: Skeleton swordsmen show up in the Egypt and Arabia houses.
- Fuuma Shuriken: The boss of the Germany house tosses giant throwing stars.
- The Maze: The Africa and Germany houses aren't straightforward like the other levels, and require you to enter rooms in a very specific order to proceed.
- Mineral MacGuffin: The eight gemstones.
- Sinister Scimitar: A favorite of the boss of the Arabia house, as well as some of his soldiers.
- Suspicious Video-Game Generosity: Each Boss Room in Ruth's castle has a hidden potion that completely restores your health. It'll be difficult to make it to the end without using at least one of them.
- Teleport Spam: The boss of the India house will occasionally blink out of the way if you deal enough damage to him, a trait he shares with Great Tiger from Punch-Out!!.
- Whip It Good: Ruth's Weapon of Choice.