Doesn't look like it has online co-op, unfortunately.
Dynasty Warriors: Strikeforce is a game unlike any other in the franchise. Until now, the quintessential Dynasty Warriors experience pitted a lone warrior against thousands of enemies. For the first time, up to four friends can join together to form a "Strikeforce". Working as a team, players can plan coordinated assaults to conquer massive armed fortresses and colossal beasts.
While immense castles, towers and ships serve as the settings for these legendary quests, the lighting-fast action will go where it has never gone before- the skies above. Gifted with new supernatural abilities characters can streak across the skies and battle enemies at high-altitude.
With both single-player and multi-player quests, new "air" fighting techniques, radical character customization, new challenges to conquer, and downloadable content, Dynasty Warriors: Strikeforce will forever change the way gamers experience the Dynasty Warriors universe when it comes to North America and Europe in 2009.
Developed by KOEI's Omega Force, Dynasty Warriors: Strikeforce is exclusive to the PSP (PlayStation Portable).