Level 4
For The Legend of Zelda on the Nintendo Entertainment System (NES).
From the official guides
The feature of level 4 is that many Vire appear for the first time, but if you pay attention to their movements, it is not too difficult to clear this level. One of the tough enemies, Manhandla, already appeared in level 3, and is also in a room somewhere in the middle of this level. If we grade level 4 as a whole, it would be a middle class level. For an advanced player, level 4 is fairly easy to clear without Water of Life, but an intermediate player may need Water of Life to do so.
As the name says, a labyrinth shaped like a snake. The enemy you see everywhere here is the comical little devil Vire. Fight it and it splits into two Keese, which is a pain. And the glowing stones in rooms 4 and 6 are creepy...
In the Snake labyrinth (Level 4), watch out for the Like Like, which just loves the Magical Shield. The beams from the statues and the Gleeok are rough!!
There is a pier around the middle of Hyrule. Take the Raft from there and you reach ruins on an island. That is the entrance to Level 4, the Snake Labyrinth. Have you bought a candle?
This labyrinth has many pitch-dark rooms. You can't get through without a candle. Buy one from a merchant before you try.
You have cleared three labyrinths so far. How did they feel? This Level 4 labyrinth is a step harder than those three. There are dark rooms, and boss-class monsters attack Link in rooms along the way. Take it on with care!
The basement rooms weren't the only secret! There was a hidden room too!!
The whole Level 4 labyrinth is shaped like a snake. The Triforce room is the farthest room from the start, so it is quite a trek. The monsters that attack Link here are mostly Vires. Some rooms have water flowing through them. But this labyrinth also has a bonus area and a basement, where something unexpected may happen. You can get lots of Rupees and pick up the Stepladder, so look forward to it.
The Level 4 labyrinth is shaped like a snake. The Stepladder is hidden underground right of center, an old man with advice is in the upper left room, and the Triforce is in the upper right room.
Map
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Rooms are drawn as the game builds them, with their numbers on the game's 16 by 8 room sheet. Each item sits on the room it is in; an item down a stairway sits on the room the stairs are in. The entrance has a green frame.
Items
KeyRoom 1: Lies in the room
TriforceRoom 3: Lies in the room
Heart ContainerRoom 19: Shows up once every enemy in the room is beaten
MapRoom 33: Lies in the room
StepladderDown the stairs in Room 50
KeyRoom 64: Lies in the room
KeyRoom 81: Lies in the room
CompassRoom 98: Lies in the room
KeyRoom 112: Shows up once every enemy in the room is beaten