This cheat are tested and 100% work .And you will get double exp every 10 sec ,and you could set the delay to become 10 sec . 

Tools : 

• Fiddler
• SWF

Tutorial : 

1. Download fiddler & instal fiddler

2.  Download SWF File

3. Open fiddler >> Drag SWF File into fiddler

4. Clear cache

5. Open ninja saga

6. Go to headquarter

7. set the delay to become 10 sec

8. Enjoy Leveling and Get Double exp in PNS Extreme ^^

Tutorial video : Here