Bottom left corner i think but you must talk do the big door first i think x
Chat with our AI personalities
all the way to the left in the haunted mansion, the big pink thing.
You can not get in the scary door in the Underground on Moshi Monsters. It is there because it is part of a Super Moshi Mission.
You can not unlock the door in the Underground on Moshi Monsters. It is part of Super Moshi Season 1 Mission 2, "Pop Goes the Goo Goo". The door is unlocked as part of the mission, but does not stay unlocked once you complete the mission.
There is a scary looking door in the Underground on Moshi Monsters, to the left of the entrance to the Disco. This door was part of Super Moshi Season 1 Mission 5 "Pop Goes the Goo Goo". During the mission you have to unlock and open the door to find the secret C.L.O.N.C. lab.
For the first Moshi Monster mission, the key is in the keyhole on the door next to the Furi. Further along in the same mission, there's a key inside the skeleton skull.