"↑↑↓↓←→←→BA", famously granted advantages when used in Gradius, Life Force, and Contra. Horizontal shoot-em-up Nemesis for Nintendo Game Boy grants full power-ups when the Konami code is entered on the pause screen. As part of the anniversary celebration, Konami has published the soundtrack from Nemesis I & II through streaming platforms.
Music for the Game Boy duology is by Michiru Yamane and Tomoya Tomita, incorporating themes from the NES score by Miki Higashino. Music from Nemesis II, localized as "Gradius: The Interstellar Assault (GB)," is composed by Yoshiyuki Hagiwara.
From the Project Zircon website:
PROJECT ZIRCONが主体となって「↑↑↓↓←→←→ BA 」、「FC版 グラディウス」の40周年をお祝いします! 企画の一環として、試遊版制作中のPROJECT ZIRCONのゲーム版にも隠しコマンド「↑↑↓↓←→←→ BA 」実装決定!続報を待とう!Konami Kukeiha Club - Apple Music / YouTube Music
Project Zircon - 【↑↑↓↓←→←→BA】40th Anniversary
【✅特設サイト公開✅】
— 【KONAMI】PROJECT ZIRCON公式「新作ゲームをみんなで創る」 (@Project_Zircon) April 24, 2026
PROJECT ZIRCONが主体となって隠しコマンド「↑↑↓↓←→←→BA」と「FC版グラディウス」の40周年をお祝いします!
多彩なアニバーサリー企画をチェックしよう!
🔽特設サイト🔽https://t.co/8GWCO3OI7v#40周年 #KONAMI #ZIRCONxFCグラディウス40th pic.twitter.com/RnPjBRKr8C


