No, Poptropica does not need nor use sound, at least to the best of my knowledge it does not.
Poptropica has no sound, as of 2009.
So far, bandwidth use and the many languages of Poptropica have prevented this.
with the wrench
Since Poptropica is a website, there is no need to install it.
You don't need to know
On Poptropica, the things you need to get is a glowstick, a pig, a flag, and a jetpack and a water bucket.
In order to minimize the download times from the servers, there is little sound on Poptropica. The exceptions include the reed pipe (flute) on Mythology Island, the phonograph recording on Time Tangled Island, and some limited sound effects.
You need to contact Poptropica, you can mail them.
you need to click the ctrl shift r in poptropica .com
u need 2 buy the bobble head in the poptropica store.
you need internet
The flag is on top of the Water Tower in Early Poptropica. You will need the jetpack to reach it. To get the jetpack, you must go through the clouds in the sky, so you need the Golden Egg from below Poptropica Towers. To get the egg, you need the glow stick from the well in Early Poptropica village.