In the ongoing debate of pirates versus ninjas, ninjas have planted a stake in the ground as publishers Microsoft and FromSoftware, and developer K2, Ltd., today announced that the Xbox 360 exclusive "Tenchu Z" has shipped to retailers across the nation. Rated "M" for Mature, "Tenchu Z" will challenge gamers to become the ultimate ninja assassin through more than 50 missions set in ancient Japan and will be available for the estimated retail price of $59.99.