Blue Bubble

For The Legend of Zelda on the Nintendo Entertainment System (NES).

From the manual

A will-o'-the-wisp. Once it touches you, you can't use your sword for a while.

Translated from the Japanese manual.

Enemy

Kind	Enemy
Japanese name	青いバブル

Official art

From the official guides

If you touch a Blue Bubble, you will regain your sword.

The Legend of Zelda (Nintendo Power) (Nintendo of America, 1988), p. 31

The powered-up Bubbles are the worst! On top of the old ones there are red and blue ones. Touch a red one and you cannot draw your sword at all, no matter how long you wait. To recover, touch a blue one or fill your life all the way.

ゼルダの伝説 (二見書房, 1986), p. 82, 101Leafy's translation

Numbers

Hits to beat it

Hits don't wear it down.

Hearts lost per touch

Touching it costs no hearts.

Drops

Drops something 104 times in 256 (40.6%). What it drops comes from these 10 slots in turn:

Rupee2 of 10 (8.1% per enemy beaten)
Heart6 of 10 (24.4% per enemy beaten)
Fairy2 of 10 (8.1% per enemy beaten)

Where it appears

Labyrinths, Second Quest

Level 4

Room 80: 1 at once
Room 113: 1 at once

Level 5

Room 14: 3 at once
Room 28: 1 at once
Room 92: 1 at once
Room 110: 5 at once

Level 6

Room 36: 3 at once
Room 51: 1 at once
Room 99: 1 at once

Level 7

Room 12: 1 at once
Room 25: 5 at once
Room 56: 1 at once
Room 73: 1 at once
Room 108: 1 at once

Level 8

Room 30: 1 at once
Room 110: 1 at once
Room 123: 1 at once
Room 126: 1 at once

Level 9

Room 6: 8 at once
Room 50: 1 at once
Room 87: 1 at once
Room 115: 1 at once

Red: rooms it is in. Green: the entrance.