Of course theres a bonus quest, no Poptropica game that does not have one. On this one, youve returned to planet Earth and received a new transmission: an alien code that needs to be cracked and translated. Note that you can only play the bonus quest if you sign up for the membership. You will also get members only items like gear packs, costumes and alien archaeology power if you do so.
Anyway, since Poptropica LC can get really difficult at some point due to the nature of the game. Specific quests are specially challenging and may require a little thinking out of the box. Here is a full Poptropica Lunar Colony walkthrough demonstrating how to beat the game. It will also show how to get important items like the key card and how to pass the eye scanner.
