Astro Knights Island, Poptropica's 9th island, was released on Poptropica on June 10, 2009. Early Access was available beginning on June 3, 2009.
Previous islands were :
- "Big Nate Island" ,released by Poptropica on February 12, 2009.
- "Nabooti Island" ,released on December 11, 2008.
- "Spy Island" ,released on September 8, 2008.
- "Super Power Island" ,released on July 24, 2008
- "24 Carrot Island" ,released in June 2008.
- "Time Tangled Island" ,released in July, 2007.
- "Shark Tooth Island" ,released in July, 2007.
- "Early Poptropica Island" ,released in July, 2007.
