Secret codes are given with items such as Moshi Monsters books, trading cards, gift sets etc and they're usually unique meaning that they can only be used once.
Limited Edition Codescan be found with many Moshi Monsters related items. You can get two codes in every issue of the Moshi Monsters Magazine, one on the back of every Moshi Monsters Mash Up Trading...
Monday Mystery Codes: Solve a puzzle in the Daily Growl each Monday and get a code you can redeem for a free item. The code is only valid for four days! Limited Edition Codescan be found with many...
Type in the code correctly with no mistakes in the box third from above on the 'Moshi Monsters - Sign In' page, where it says "If you have a secret code, you can enter it here: " When you reach your...
A secret code on Moshi Monsters enables you to get a rare object unavailable anywhere else. For instance- Dustbin Beaver Poster: giftisland23 Moshling Collector Chart (Poster): allmoshlings Lavaflow...