Steps:
1.Open Fiddler and go to Autoresponder
2.Tick both Enable auto... and Permit Passthrough..
3.You will be replacing the data_library_en file so click ADD and insert this rule editor
REGEX:(?insx).*data_library_en\.swf$
4.Replace it with the downloaded file from the links above.
5.If you are unsure of how to replace files using fiddler, kindly read the tutorial first as it will help you greatly. (Tool's Tutorial)
6.Once replaced, just go into Ninja Saga, equip yourself with a KUNAI and you will have 999999 damage.
7.Tested, working, and savable as at 28/6/2010
Tools needed:
Damage Hack .swf (download links below)
Fiddler2
Chrome/Firefox
