The most complex and difficult, especially for younger players is Astro Knights island, which uses some new concepts (coordinates, optional order for the planets). But many have figured it out eventually.
Steamworks and Skullduggery are also complex in their design. Often completing quests such as Mystery Trainor Shrink Ray can be complicated because it is possible to pass up a critical piece of information and arrive at an impasse when the later parts of the quest are attempted.
Time Tangled Island (3rd island) is harder than some later ones, because you have to figure out which items go to which time zone, in which order.
there is no lapso island on poptropica
There is no Candy Island on Poptropica. There is no known plan for a Candy island on Poptropica.
Poptropica Island is already unlocked.
The 6th island in Poptropica was Spy Island.
The 3rd Poptropica island was 24 Carrot Island.
It is Shark Tooth Island after Early Poptropica Island.
there is no pet island on poptropica
The 19th island on poptropica is Magic Tree house Island.
The 21st island on poptropica will be mystery train island.
There's not a planned Candy Island for Poptropica.
Where is the warehouse on poptropica's spy island?
There is currently no Ancient Island on Poptropica.