In order to access Big Ben (which is the last area to complete before getting access to Mooshu), you must complete the main storyline quests in Hyde Park, Chelsea Court, Ironworks, Newgate Prison, Knights Court, Katzenstein's Lab. At that point, you go to the museum and do Counterweight East and Counterweight West. This will open up Big Ben.
Is there a board with the "other tower quests" listed? seems like i have fought many bosses but still aren't close to the finale. :-(
I think that Marleybone is the longest world in this game. If you look at your map when you are standing in Regent's Square, you will see the names of the different locations in Marleybone. You need to follow the storyline and do each of these areas. IT IS A LOT ! ! !
You might want to check out the Wizard101 Central fansite. They have a lot of lists / guides for all of the worlds.
you have to finish this mission in this katzstien lab or something then it will tell you go to the museum to talk to sherlock bones then you talk to this guy in front of him and he tells you to complete clockwork west and east it think then after you finish that sherlock bones tells you to go defeat meowiarty where these to dog policemen XD are standing and then thats the big ben mission :D if this is wrong sorry :( but I'm on the big ben mission and need help with it