BALL AND CHAIN TROOPER
[Behavior] They walk around the room swing their Ball and Chain in a wide circle over their head. Sometimes the swing is fast, sometimes slow, and always they pick up the speed if they see you.

[Tactics] Equip your shield and stay close to it. Bounce and hits off you shield, and when the fiend actually throws the ball at you, charge in and slash it a few times.

[Tidbits]

BIRI
[Behavior] Can be found anywhere there is deep enough water. They swim towards you, and shock you if they touch you.

[Tactics] They can be killed with the Boomerang, and the hookshot. Avoid them (be especially careful when facing large groups of them).

[Tid-bits] They're first appearance was in A Link to the Past.

BOULDER
[Behavior] Boulders, erm, tumble down a cliff or hill from a random spot at the top and follow an indiscriminate path as it bounces its way down.

[Tactics] Don't stand under it! (See? You're getting your money's worth with this amazing information.)

[Tidbits] Boulders are the only inanimate enemies Link faces.

BUBBLE, or ANTI-FAIRY
[Behavior] Bubbles move around the room, often hugging a surface like a block or wall. If you step in front of it, it will hit you, shocking you. Some varieties are more life-like than others, laughing as it chases you around the room. Also, some varieties drain health, magic, or both.

[Tactics] Those that actually chase after you are best defeated by using your shield to stun them when they run into you, and then hit their skull with a few sword swipes. You have to avoid the other ones.

[Tidbits] Because Bubbles are corrupted fairies, in certain games you can use your boomerang to turn them back into their original form. Free Fairy, score!