Nintendo Official Guidebook
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Nintendo Official Guidebooks have been released for all five games in the The Legendary Starfy series under Shogakukan's Wonder Life Special imprint. The guidebooks offer help with completing the game. The guidebooks provide maps of the different levels, enemy locations to complete the Picture Book (excluding The Legendary Starfy as the player has to buy Toys with Pearls), the methods of unlocking the Stuff, the methods of unlocking music (this doesn't apply to Densetsu no Starfy and The Legendary Starfy as all the music is available in these games when the Sea Jams is unlocked) and more.
The Nintendo Official Guidebooks have been published since at least 1996, with the release of the Nintendo Official Guidebook for Wave Race 64 on October 18th, 1996. Information about the different guidebooks can be found on 21010net - Nintendo Net, and some example pages, including pages from the Legendary Starfy series guidebooks are available from the site's catalog (Japanese: カタログ) section.
Front cover of the Densetsu no Starfy Nintendo Official Guidebook.
Front cover of the Densetsu no Starfy 2 Nintendo Official Guidebook.
Front cover of the Densetsu no Starfy 3 Nintendo Official Guidebook.
Front cover of the Densetsu no Starfy 4 Nintendo Official Guidebook.
Front cover of the Densetsu no Stafy Taiketsu! Daīru Kaizokudan Nintendo Official Guidebook.