There are no "cheat codes" for ANY game on Poptropica. The game is run exclusively through the website server.
However, there are both solutions and walkthroughs at the listed questions below.
(see related questions)
on astro knights island
astro knights island
astro knights
After the Astro Knights island release in June 2009, the next regular feature was Poptropica's Haunted House in October 2009. (Available through the Poptropica Store) The next scheduled island was Counterfeit Island.
Astro Knights
you have to find the UFO in astro knights island.
its in the muesuem
no
At the Poptropica website, all available islands appear on the Island Map.
There will be a new island on Poptropica called Astro Knights.
Poptropica. (see related link)
you can get the coin in astro knights island on the fountain