How do you get into the dungeon on Poptropica?

Answer 1

I assume that by dungeon you mean the dungeon on Astro-Knights Island. If not, then pay no attention to the rest of this.

If you get the gold coin from the fountain, (walk over the shiny glare to receive it) you can pay for admission to the house of Mordred. Simply click "USE" when inside the house. Once the attendant lets you in, click on the large stack of books on the bottom floor. He (the attendant) will say that the books must remain the way they are but give you a library receipt.

Now go into the castle (look on your map or go right until you see a semi-destroyed building). One of the two rooms on the bottom floor is the library. Look at the receipt. Underlined is "McM". If you go down the stairs, click on the McM button on the shelf. A secret trapdoor will open. Go down to get into the dungeon.

If you need to get into the dungeon the SECOND time, purchase the Astro-Knights guide on Astro-Knights Main Street.