-You can only use the Katana.
-You DONT have to follow the Code of Honor.
-Use simple/quick moves on drones and everything in your inventory on bosses.
-If you die you will never get to play Katze.

Boss	Description	Level
1	A Girl that is on a constant move. A good back stab should do the trick.	10
2	Almost exactly like Boss 1.	20
3	Almost exactly like Boss 1, but quicker.	30
4	Try to use a devastating hit to finish off this one fast.	40
5	Exactly like Boss 4.	50
6	Block and counter attack the whole time.	60
7	Almost exactly like Boss 6, but quicker.	70
8	Side step until you get an open shot.	80
9-19	These are the Bosses you have already killed. Use the same techniques as you did the first time to kill them off.	90-100
Boss	Description	Level

Article Source: Kuponut.com : Bushido Blade Slash Mode  :  http://www.kuponut.com/cheats/bus/slash_mode.html