Earworm is a passive item in Battle Fantasy, a mod for The Binding of Isaac.

Randomly plays a sound effect after a random amount of time, ranging from 15 to 60 seconds. The sound effect that plays will attempt to trick Isaac.

Whenever a sound effect plays, all enemies in the room get concussed and Isaac gains +0.45 speed for 10 seconds.

The item has a chance to grant its buff early and reset the randomized cooldown upon performing certain actions, playing a specific sound effect to intentionally trick Isaac.

Additional copies of Earworm decrease the maximum amount of time between sounds playing, equal to 60 / NumberOfEarworms seconds, and can't go below 15 seconds.

Earworm can be found in the following item pools:

The following tags are applied to this item:

The following special synergies and interactions for Earworm have been documented.

* Note that not all possible synergies and interactions are listed here.

• Download Battle Fantasy from the Steam Workshop.