Brain stone

Brain stone さとりのいし Comprehension Stone
Artwork of the Comprehension Stone from the Mother 2 strategy guide
Type	Miscellaneous item
Appears in	EarthBound

The Brain stone is a key item in EarthBound. While intended to prevent loss of concentration, a bug prevents it from serving it's intended purpose, and in fact does nothing.

Usage

The Brain stone has no effect whatsoever. It was intended to prevent loss of concentration during battle for the party member who has it in their inventory, however due to a coding mistake, the code that checks whether or not the party member is carrying the Brain stone does not appear, thus resulting in the item never working in battle.

Prices

In-game description