Download required files 1) sharecash 2) upload 3) megaupload - choose your preferred download link
Some got banned, some did not. Use at your own risk!

Steps.by.pwnthis :

a. Download the files above.
b. Open Fiddler.
c. Go to Autoresponder and ensure both ‘Enable Automatic.. ‘ and ‘Permit pass…’ are ticked
d. Click ADD.
e. A ‘String To Match’ will appear, change it to REGEX:(?insx)^.*mostwanted\.swf$
f. Click on the ▼ button beside the Save and select ‘File a file’
g. Browse to the files that you have downloaded above and select ‘mostwanted.swf’
h. Click SAVE
i. Click ADD again.
l. A ‘String To Match’ will appear, change it to REGEX:(?insx).*data_library_en\.swf$
m. Click on the ▼ button beside the Save. And select ‘File a file’
n. Browse to the files that you have downloaded above and select ‘data_library_en.swf’
o. Click SAVE.
p. Clear browser cache and reload/enter Ninja Saga.
q. You will have 4 new missions in the lowest Grade.