The Extras Menu is a feature of Metroid Prime 3: Corruption, New Play Control! Metroid Primes 1 and 2, and Metroid Prime Trilogy. It is split into several subcategories: the Concept Gallery, for the purchase and viewing of conceptual artwork for the Prime games, the Bonus Gallery, for the purchase and use of miscellaneous content in the games, and the Soundtrack Gallery, for the purchase and listening of music in the series. Bonus Credits and Friend Vouchers are used to purchase this content. In the original Metroid Prime and Metroid Prime 2: Echoes, the extras were not purchased with credits, and were instead unlocked with item and Logbook completion percentages.