There is a bat flying at the top of the house, with the key. Jump up and grab it. The basement door at the far left is opened.
To open the door to the basement on Haunted House in Poptropica, you first must get the key which the bat is flying around with. Then use it to unlock the padlock and onpen the door!
There is a lock on the basement door.
It is where you enter the house. Catch the bat with the key and the basement door to the left of the house will be open.
In the room to the right of the basement door, to the opposite side from the kitchen.
When you grab the key from the bat, the basement door (left side) opens.
You walk over to the far left side of the house, where the basement door is now unlocked.
Climb to the roof and you can jump up and grab the key. The basement door at the left of the house will be open.
Look in your Item Bag under "Purchased Items" and select "enter" on the Haunted House card. Once you are at the house, you will notice that the door is boarded up. climb to the top of the haunted house and you will see a bat flying with a key. Get the key. <(this may take a while) after you get the key, go to the far left and enter the cellar door. You are now in the haunted house!
Catch the flying bat to get the key. The lock on the basement door is now open (left side).
Use it to unlock the door at the far left in Greg's house.
If you are in the house, go to the bottom level of the house. Then go through the door to the basement. Go all the way to the left and click on the Kerosene. That will light your lantern.
The cellar is all the way to the left of the house. There is a padlock on the door, however, so you first need to get the key from the bat flying around the outside of the house.