Super Mario 64: Castle Secret Stars, Cap unlocks for the Red Blue and Green Boxes

As well as the stars in every level in Super Mario 64, there's a handful of stars hidden elsewhere.

Princess Peach's Castle, Super Mario 64 Official Wikia

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Castle Secret Stars - Super Mario 64 DS Guide - IGN

Peach's Castle Secret Stars - Super Mario 64 Walkthrough

Peach's Castle Secret Stars - Super Mario 64 Walkthrough

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Castle Secret Stars - Super Mario 64 DS Guide - IGN