To coincide with the launch of Card-Jitsu on Club Penguin Rewritten, a new code has been released that unlocks the Stone Ninja Suit. The suit first appeared in series 17 of the original Club Penguin’s Treasure Book back in July 2012. To unlock the code, head over to play.clubpenguinrewritten.pw and click on the “Unlock Items Online” button.
After you’ve logged in to your penguin, click the “I have a code” button.
Type in the box “CARDJITSU” and click “Done”.
After that, you should unlock your suit.