The dragon on Astro Knights island
When you pull the lever, the fire goes out in the dragon's mouth. Very quickly jump in front of him and fire the Ice Arrow into his mouth. You have to climb over and repeat this 3 times.
Cerberus on Mythology island
Just pick up a whisker.
Hydra on Mythology island
When all 5 heads are knocked out, swim past the Hydra to get a scale.
The question is not specific enough. (see the related questions for a possible answer)
you make it go to sleep and shoot it in his mouth 4 times
the minotaur is a beast.
see poptropica secrets
In the underwater cave.
go to the place where you got the reed pipe and find a statue that's holding one, click on it and it will teach you a song. play the song to Cerberus and he will fall asleep
You climb on the ropes to get to the back of the monster and get passed the spike ball after you do that you pull the lever and the monster will fall asleep and and you stab the monster in the mouth and do this twice more and you will defeat him.
it won't if you defeat him!
at hades
you have to climb the ropes
You collect sacred items and defeat Zeus to save Poptropica.
yes