Floormasters are recurring enemies in The Legend of Zelda series. They appear as giant hands comparable to Wallmasters. In some of their appearances, they will bring Link back to the beginning of a dungeon or area.
Ocarina of Time
Floormasters are enemies that are found while Link is an adult. Their first appearance is in the Forest Temple. Floormasters will jump in the air and turn green if it sees Link, charging at him and sending him flying backward. After a few strikes, the Floormaster breaks into three mini-hands. If Link waits too long, then the three mini-Floormasters will join back together and create another normal-sized Floormaster. Also, if Link lets a mini-Floormaster grab him, it will suck magic out of him to become a normal Floormaster. In the Shadow Temple, some Floormasters are invisible and can only be seen with the Lens of Truth.
You know the Floormaster, right?
Oracle of Ages and Oracle of Seasons
This is the third and fourth appearance of the Floormaster in the Zelda series. The Floormaster takes a different form in these games: a blue hand that comes out of the ground. If the hand comes out and grabs Link, it will pull him down and make him start at the entrance of the dungeon again.
The Wind Waker
The Floormaster once again takes on a different form in The Wind Waker. It is a black hand coming out of a purple glow in the floor. This time around, a Floormaster will grab Link and take him back a few rooms. It can also kidnap Medli or Makar in the Earth Temple and Wind Temple respectively and put them in cages. In addition, they can grab nearby items like skulls or jars to throw them at Link.
Link can kill them with a normal attack. If Link attacks it with a Bomb, the Floormaster will throw it back. Link is hidden from the Floormaster when carrying a Bomb in his hand.
Four Swords Adventures
Floormasters are pretty much the same as in The Wind Waker, but instead of sending Link back a room, they will grab him and take him to the Dark World. In the Dark World, Link must find his way back by using a portal. In Four Swords Adventures, Floormasters can not be killed. If Link hits one, it will be stunned for one or two seconds. The only way Link can get past without being noticed is by carrying the Moon Pearl, but the pearl can be stolen out of Link's hands.
The Minish Cap
This time, the Floormaster is a blue levitating hand that will grab Link and throw him back to the start of the dungeon. The Floormaster will not attack Link in Minish form unless he approaches them. Floormasters can be killed with the Sword, but they can not be attacked while levitating.