Gunvalkyrie is an action-packed third-person shooter video game released for the original Xbox in 2002. Developed by Smilebit and published by Sega, the game takes place in an alternate history during the early 20th century. Players control members of an elite unit known as Gunvalkyrie, who are tasked with investigating and combating alien creatures and other anomalies. The game is renowned for its challenging gameplay, unique boost system for navigation and combat, and its retro-futuristic steampunk aesthetic.