Stage: Rescue at Ueda Castle. Method: Get to the fifth level of the castle in less than 4-5 minutes. A special item message should appear. Go to where Sanada and Hanzo are fighting and do not enter the room where they are fighting go to the one on the left and there will be two treasure boxes there one regular weapon and the other one your special weapon. Do this fast before Sanada Retreats and the stage will end. You don't even have to kill anyone.