So first you need these 2 programs:
1.Cheat Engine (http://www.cheatengine.org/)
2.Mozilla Firefox

So Lets Get Started:
1. Go to your Facebook And open Ninja saga (BUT DONT LOG IN)
2. Now Open CE (Cheat Engine) and for Process put Firefox
3. Now put in Value: "3B0008C25B5E0689" (Hex, 8 bytes ASROM)
4. You Should Get 2 Addresses, right click on 2nd and "Disassemble This Memory Region"
5. You should get new window on that window press right click and "Toggle Break Point"
6. Go Back to Firefox and press play on Ninja Saga
7. Go Back to CE and 2 times press F9
8.
On Right Side of that window you should get EAX "XXXXXXXXXXX", press on
that and put new value e.g. 144 (that will put you on lvl 2, later i
will explain why only lvl 2)
9. Now right click and press "Toggle Break Point"
10. And F9 again
11. And Viola! You’re on lvl 2 LoL


So
now i will explain why not lvl up immediately on lvl 19....... you Can
lvl up your Self only lvl by lvl (so if you wanna be lvl 3 you need to
do this hole process over again and in EAX "XXXXXXXXXXXX" put right
value), cuz if you lvl up your self immediately on lvl 3 you char will
be deleted, this take time but its worth :DDDDD

So these are Values For Each lvl:
1-11 (but you are on start lvl 1)
2-144
3-378
4-544
5-733
6-No Code you Must lvl up your self with out cheating
7-1000
8-1600
9-2600
10-No Code you Must lvl up your self with out cheating
11-3600
12-4600
13-5600
14-6600
15-7600
16-9000
17-No Code you Must lvl up your self with out cheating
18-No Code you Must lvl up your self with out cheating
19-11000
20-13000

I
Did This only till lvl 20 cuz if you go on lvl 21+ you wont have any
skills and gold so you cant do quests.........in one word you will be
weak..........