This gives you all characters lvl 256, lots of cash 255 sandwichs/bombs/potions, and all weapons/pet orbs.

Requires:
USB Xtaf Xplorer - [ Register or Signin to view external links. ]
Modio - [ Register or Signin to view external links. ]
HxD Hex Editor - [ Register or Signin to view external links. ]
Steps:
1.) Download the required programs above.

2.) Place your usb into your Xbox 360's bottom USB slot to the right of the power button. Then transfer the account into the USB. (Make sure that account is not logged in.)

3.) Place the USB into your PCU, and open up USB Xtaf Xplorer. Open up your account which will be the last one. then go into the next file that will start with a F, then click the next file till you find your account which will be the one with out {dir} infront of the file then extract that onto the desktop.

4.) Now open up HxD Hex Editor and drag that file on to it, then click ctrl + f , and search for "Castle Crashers" and leave data type as text-string, then check uni-code string and find.

5.) Highlight from .C.a.s.t.l.e. till the .{ or .( which is a little bit downer then 9 under 8.
Then Paste this code over it.

Code:
.C.a.s.t.l.e. .C.r.a.s.h.e.r.s.....8:._8...........U.1....................9:._8.............1......................
...........c?z....j..........................................................N........B?.............
..........B.....?.....@.....A.........F.....F.....F.....F.....F.........F.....$.....F.....F.....F....
.F.....F.....F.....F.....F.....F.....F.....F.....F.....F.....F.....F.........F.....F............8....
...........9............c?.......{

6.) Save it and open up Modio to rehash and resign it. then open the USB Xtaf Explorer and do the same thing as last time. delete the old profile in that folder and inject the new one which will be on the desktop with the mod.

7.) After all this pop that baby back into the xbox 360 and put it inside your HHD or MU, then BAM lvl 256 every character on castle crashers!