Level 1 (First Quest)

Level 1 is the very first dungeon of the very first Zelda game. It is sometimes also known as 'The Eagle', because its map layout is shaped like an eagle (all of the dungeons in the game have maps which form some sort of shape).

Location
Level 1 is the only dungeon on the game which is in the same place in both the first and second quests. It is inside a tree found on an island in the middle of Lake Hylia, in the central area of the game's world map. The island is accessed by crossing a small bridge from the east.

After another dungeon set inside a tree, Inside the Deku Tree from The Legend of Zelda: Ocarina of Time, speculation arose among fans that Level 1, too, was set inside a dead Deku Tree. However, this is little actual evidence for this, and coupled with the fact that no other form of Deku Tree appeared until Ocarina of Time, it seems that this theory is unlikely, although there is no technical reason why it could not be true.

Items

 * The Boomerang is found in a cellar of the dungeon.
 * The Bow is also found here, but to use it Link must buy arrows from outside the dungeon. Note: in the Second Quest, the Bow is instead housed in Level 5.
 * Heart Container
 * As with all of the first eight dungeons on the game, the ultimate prize is the piece of the Triforce of Wisdom guarded by the boss.

Enemies

 * Keese
 * Stalfos
 * Goriya

The dungeon was also guarded by motion sensitive spike-traps.

Boss

 * Aquamentus

Key Glitch
One of the simplest Zelda glitches allows the player to save a key. Entering the dungeon (in the First Quest only), a locked door can be immediately seen at the north end of the room. Exiting the dungeon and entering again causes this door to be unlocked, making it possible to finish the dungeon with a spare key. Because the rule that keys would only work in the dungeon in which they were found had not yet been imposed on the series, this key could be used to save time in other dungeons. However, as it is also possible to buy an essentially limitless amount of keys from merchants in the game, the only real purpose the glitch serves is saving the cost in Rupees of one key (80 or 100 Rupees, depending on where they are bought) or decreasing the time required to complete the dungeon (a result of which is that this glitch is popular with speedrunners).