Valkyrie no Bōken: Toki no Kagi Densetsu[a] is a video game developed and published by Namco.

Without in-game hints or advice, the player must devise a plan to defeat Zouna, with many of Valkyrie's tasks not immediately apparent; some can only be guessed by exploration and experimentation.

Zouna wreaks havoc in Marvel Land, darkening and terrorizing its people and laying waste to the countryside.

Their arcade game ports such as Pac-Man and Xevious were unprecedented successes, and generated a lot of revenue for the company.

[3] Joining Namco after graduating college, Fujii was initially assigned to the company's design department, working on the package artwork for games like Sky Kid, Tower of Babel, and Family Tennis.

[3] Once the division was dissolved, he was transferred to the game development department, becoming a character artist for Valkyrie no Bōken.

[3] Due to hardware limitations, his drawings could not be accurately replicated in the game itself; most notable of these is Valkyrie herself, being blond on the cover art and having black hair in-game.

[8] Both of these could be downloaded through the company's official game services through these networks for a monthly fee, and featured all new graphics in the vein of its arcade sequel Valkyrie no Densetsu.

Valkyrie no Bōken was resurrected for the PlayStation in 1998 on Namco Anthology 2, with an upgraded (linear) version of the game side-by-side with an emulation of the Famicom original.

Walküre no Densetsu Gaiden: Rosa no Bōken is a visual novel game released by Namco for Windows on April 26, 1996.

In it, the Great Goddess tasks Rosa with pursuing the monster Tōrushin on a floating island in the sky over Marvel Land.

In 2007, Namco released The Glory of Walküre, an upgrade of the original game with enhanced graphics, for Japanese cell phones using the i-Apli system.