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Brain stone

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Brain Stone
さとりのいし Comprehension Stone
Brain stone.jpg
Artwork of the Brain 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

EarthBound
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In-game description

A miraculous stone that enables you to "concentrate" without using your own brain. This is accomplished just by your keeping this item. This is great because if you can't concentrate, you can't use PSI.