Eyegore

Eyegores, also known as Rocklops, Eye Guards or Cyclopes, are large creatures with a single eye. Aside from the eye, they are invulnerable. They lay dormant and wait for Link to approach, waking and pursuing when he does so. The name is a pun on one of the pronunciations of the name "Igor."

The Legend of Zelda: A Link to the Past
Rocklops appear in many dungeons. They appear in green and red, and both wear orange cloths and capes. The green ones can be defeated with a thrown jar or arrow in the eye, while red ones require three arrows. They often appear in groups. Additionally, large Rocklops statues appear in the dungeons as well, often for decoration, and some holding Telepathy Tiles. Most are gold, but one Rocklops statue, colored green, reveals a secret passage if shot in the eye. Similar statues are seen without the creatures themselves in Link's Awakening and the Oracle games.

The Legend of Zelda: Majora's Mask
Two Eyegores appear in the Stone Tower Temple, both on the same bridge. They are depicted as large and slate-colored, having a thin purple torso and limbs, blue armor, and a large, glowing eye on top. The first one stomps slowly after Link, occasionally pounding the ground with its fists while sending up rocks, which turns its cyan eye yellow. From here, it can be damaged with the Hero's Bow or Hookshot, turning its eye red briefly. If he attempts to walk around it, it will swipe him away with its claws. The second one is encountered when the temple is flipped. It attacks much the same, but it can fire explosive lasers from its eye as well, leaving it open to attack. Attacking it while it fires lasers does not damage it, but stuns it and turns its eye yellow, allowing it to be actually damaged. Neither Eyegore respawns until a new three-day cycle is started.

In the original game, the first Eyegore will stomp across their bridge if Link moves around underneath it, but in Majora's Mask 3D, it no longer reacts to him here. Additionally, the second Eyegore guards the Giant's Mask in the original, but no items in the 3DS version due to the mask being moved to the Twinmold fight.

The Legend of Zelda: Four Swords Adventures
Eyegores are encountered en masse in one room of the Desert Temple. They act like their A Link to the Past appearance, but somewhat resemble the Eyegore Statues from Four Swords. Inanimate Eyegore statues are found in the Eastern Temple, which look the same as the ones in A Link to the Past, except gray.

The Legend of Zelda: A Link Between Worlds
Eyegores appear mostly as they did in A Link to the Past. They are slightly taller, and additionally appear in blue, being medium-strength. Eyegores can now be attacked in the eye with the sword. Their eyes also function as headlamps in dark rooms. A green Eyegore is first found in the House of Winds, and a blue Eyegore is first found in a water-filled room in Thieves' Hideout, being the only one of this color outside the Treacherous Tower. A quintet of red Eyegores appear as a mid-boss in the dark in Thieves' Hideout.

A Link to the Past comic
In the comic adaptation of The Legend of Zelda: A Link to the Past by Shotaro Ishinomori, a Rocklops called Rocklops #1 appears in the Palace of Darkness, where it is depicted as a giant, black, one-eyed, humanoid robotic statue with a large mantle. It catches a disguised Link trying to blow up the stockpile of Firecorn, and sends a group of Hinoxes and Gleeocks after him. However, Link manages to detonate the stockpile, destroying all the monsters.

BS Zelda no Densetsu Inishie no Sekiban
In BS Zelda no Densetsu Inishie no Sekiban, Eyegores again appear in green and red, first appearing in the Eastern Palace. The green ones can now be defeated with the sword, though it takes a very large amount of strikes.