Level 2
For The Legend of Zelda on the Nintendo Entertainment System (NES).
From the official guides
The Underworld maze, level 2 has a crescent shape like the crescent moon. Even if it's a little tougher than level 1, you won't have much difficulty in level 2. Since you have already cleared level 1, you now have four Life Hearts.
Level 2 (Moon) is full of Rope snakes. The first time you meet them their sudden charge takes you by surprise, but they are weaker than they look and often drop treasure, so this is a good place to earn!
The Moon labyrinth (Level 2), shaped like a crescent moon, has no basement rooms! To make up for it, sort of... if you visit every room that gives a key, you end up with one key to spare! So even if you miss one in the next labyrinth, you are fine!
Level 2, the Moon Labyrinth, is inside the ruins about five screens to the right of the Eagle Labyrinth (Level 1). To get there, though, you have to come around from farther to the right. Have you got a potion?
The Triforce is in the place farthest from the start. Many walls can be blown open with bombs, so choose your route and go through the rooms efficiently.
Make sure you get the Magical Boomerang in this labyrinth. Getting it is quite dangerous, though.
Go in with plenty of Bombs. Dodongo has a weak point... it really does!
In Level 2, an army of snakes swarms out. They aren't very strong, but they sometimes speed up all of a sudden, so stopping them with the Boomerang and then attacking works well. The labyrinth is long and narrow, with lots of walls you can break. Use your bombs. It is about as hard as Level 1. Now, take it on without flinching!
The Level 2 labyrinth is shaped like a moon, and the Triforce is hidden at the very top.
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
TriforceRoom 13: Lies in the room
Heart ContainerRoom 14: Shows up once every enemy in the room is beaten
BombsRoom 30: Shows up once every enemy in the room is beaten
5 RupeesRoom 47: Shows up once every enemy in the room is beaten
KeyRoom 62: Shows up once every enemy in the room is beaten
BombsRoom 63: Lies in the room
KeyRoom 78: Shows up once every enemy in the room is beaten
Magical BoomerangRoom 79: Shows up once every enemy in the room is beaten
MapRoom 95: Lies in the room
KeyRoom 108: Lies in the room
CompassRoom 111: Lies in the room
KeyRoom 126: Shows up once every enemy in the room is beaten
Enemies
Blue Goriya3 in 1 room
Red Goriya10 in 2 rooms
Gel16 in 3 rooms
Blue Keese4 in 1 room
Rope32 in 6 rooms