Dynasty Warriors is a hack and slash video game developed by Omega Force and published by Koei for the PlayStation Portable. A spin-off of the Dynasty Warriors series, it was released as a launch title for the console in Japan on December 16, 2004 and as a launch title on March 17, 2005 in North America, and September 1, 2005 in Europe. A sequel, Dynasty Warriors Vol. 2, was released in 2006.