You take the princess message to the goth girl and she will give you a pattern. Click on the stone carving of the fountain.
You can't open the front of the cell. You have to go in the back way. Throw the switch in the dungeon and then go back out. You can enter from the tunnel to Mordred's secret underground lab. (see the related question)
There is no way into the cell from the library. Throwing the switch opens the "back gate" to the cell, which you can access from Mordred's underground laboratory. (see related question)
You can't open the cell from the library entrance. Get the cheese and open the back gate by throwing the switch. Later you can get through the back entrance from Mordred's underground lab. (see related question)
You can't open the cell from the library side. Get the cheese and throw the switch that opens the back gate to the cell. You can enter the back way from Mordred's underground laboratory. (see related question)
The Castle DungeonThere is an entrance to the dungeon from the castle library (and another one from Mordred's underground lab). If you get the gold coin from the fountain, you can recover the Library Slip from the Mordred museum. Then you can open the secret stairs into the dungeon.The Secret SocietyOnce you have the secret message from the Maid's room in the castle, you can get the new password from the girl in the Mill loft, and access the secret room under the village fountain.(see related questions)
There is already a tunnel from the back of the dungeon cell under the castle library. It leads to Mordred's underground laboratory. Once the switch is thrown from the library side, the gate is open to the cell. In Mordred's lab, push hard to knock down the dirt wall. (see the related question)
Back Gate to the Dungeon CellThe front entrance to the dungeon cell does not open. Throwing the switch opens the rear gate, which is accessed from Mordred's secret laboratory.The Golden Key and the Portal GateYou need all three knights with you to pull the Golden Key from the Crystal. This means beating all three planets.(see related questions)
with a key!
*The ordinary key fits Mordred's underground laboratory. To get the key to Mordred's lab: # Get the secret message from the Maid's room (castle first floor, to the left) # Take it to the girl at the mill (upstairs) to get the password # Go to the fountain, on the brass plaque. Press the 3 symbols and the sun. # Get the key from the hooded fellow at far right.
There are no caves on Astro Knights island.There is the Volcano on the fire Planet. Jump from the 5th to the 6th platforms when both geysers are moving downward.There is also Mordred's secret underground laboratory. To enter it :Get the gold coin from the fountain.Go to the Mordred Museum and get the library slip.Go to the castle library and down into the dungeon.Get the cheese and throw the switch.Go to the Princess's Maid's room and get the mouse and Secret Message.Go to the mill and get the password Cosmic Symbols from the loft girl.Go to the fountain again, open the base (3 symbols and the Sun). Get the key to Mordred's lab.Go to the field's hay bales and push them left and apart.Open the lock on the secret underground lab
There are "hatches" on at least three Poptropica islands:Astro Knights Island - the underground "hatch", between the hay bales on the farm, leads to Mordred's underground lab. There you will find Mordred's Journal, the robot owl Merlin, and a tunnel that leads to the castle dungeon. The key is in the secret chamber under the village fountain.Counterfeit Island - the Dragon Face hatch leads from the Underground into the Museum Fantastique. It can be opened by rearranging the features on the face.Steamworks Island - there is a hatch that leads to the underground machinery of the Hub, but it is too hot to open. Once it is cooled down, you can open it and go down to restore power to the Hub, including its elevator.(see the related questions)
Click on the sign for the McM section. You need to have Mordred's library pass to do so.