Instructions
Navigate to the Poptropica website and log into your account. Select "Mythology Island" on the top left of the map. It is next to "Spy Island."
Walk all the way to the left when your air balloon arrives on Mythology Island. You'll see a sign indicating you are on your way to the "Tree of Immortality."
Keep going left until you see stairs. Jump up the stairs to reach the tree. Go up through the branches until you see the half-man half-goat creature (known as a "Satyr" in Greek mythology). Click the satyr and you'll receive a mission to find jars of honey in under a minute.
Collect all 10 jars of honey scattered around the tree and speak to the creature at the top of the tree again. He will show you a new path that takes you to an apple. Click the apple to trigger a new scene with Zeus.
Climb down the tree then go down the stairs. Go right and return to town. Continue through town past the sign that reads "Grove Of Temples."
Continue walking past the half-man half-goat with the purple hair. It will stop you and tell you that you need to be on a mission from the gods in order to proceed if you have not done the Zeus scene yet.
Jump down the cliff and you'll be in front of a temple covered in skulls. Speak to the man walking around in front of the temple and he will tell you that you can earn one drachma for cleaning the graffiti.
Left click the graffiti to zoom in on it. Hold down your left mouse button and move your mouse cursor around to erase the text. The man will thank you and give you a Greek coin once you have cleaned all three pieces of graffiti.