The saucer Excalibur can only make it to the Pewter Moon, where you get a spaceship to
search the three planets (fire, ice, and jungle). It does not matter in what order you
play them, but you must defeat all three planets.
Planets in the solar system (three are listed on the Queen's coordinate list):
The planet Poptropica, where Arturus is located, at coordinates X-56 Y-52. These are
the same as the coordinates for the technologically-developed Pewter Moon which orbits it.
The Jungle Planet, at X-15 Y-15. (Home of the Phoenix Birds.)
The Ice Planet, at X-73, Y-83. (Home of the Snow Panther Copter.)
The Fire Planet, at X-83 Y-20. (Home of the Fearsome Fire Beast.)
Other locations in the system :
The Black Hole, at X-85 Y-47. (Dangerous but useful.)
The Secret Planetoid, in the Asteroid Belt at X-11 Y-84. (Lair of the Binary Bard)
The sun of Poptropica, at X-25 Y-42. (Big and bright, but only decorative.)