The Big Eye is a lid-less, retina-less eyeball monster (just a plain giant eyeball) that bounces or rolls across the screen.
In its first appearance in Haunted Castle, the Big Eye (called simply "Eyes" in this game) fall from pairs of eyes affixed to the walls of some levels. When approached, a single eyeball is launched and bounces about the stage. Its more iconic version was defined in Castlevania: The Adventure, where it rolls across the screen in one direction. This version reappeared in its sequel (Belmont's Revenge) and its remake (Adventure ReBirth). Often times there are an endless stream of them, initially falling down from a high place. In the Game Boy titles, they will explode when struck, which can destroy some platforms that they are rolling on.
- Main article: Peeping Big
A giant form of the Big Eye appears as the end boss of the first stage of Adventure ReBirth. It bounces and rolls around and ejects smaller Big Eyes from its pupil. It can also turn around and fire a large beam. Dracula's final form in the game also summons Big Eyes out of mystical symbols.
|Enemy Data: Big Eye|
|Image||Name - Game|
|'|| HP: 1|
| 3. Banquet Room|
|'|| HP: 1|
| Castle stage|
|Quick reflexes will defeat the rolling Eye. Watch for them when you climb ropes. In some cases, you can jump over them.()|| HP: 1|
| 1. Forest, 2. Cave|
|'|| Crystal Castle, Rock Castle, Plant Castle|
|A large eye that spawns indefinitely at set points.()|| 1. Castle Bridge, 3. Dungeon, 4. Chapel, 5. Clock Tower|
|An enlarged eye that rolls along the ground.()|| 1. Castle Bridge, 6. Castle Keep|