The game hub is the detective's home, 221B Baker Street, the small set of appartment rooms owned by strict landlady, Mrs Hudson. From the start, you can access Holmes' room, aka the Armoury. You can choose your mission on his 'Case boards' with all the different adventures joined up with ribbon. You can also enter cheat codes at his bookcase. In Watson's room, also available from the start, you can access the minikits on his display shelves (unlocked by collecting 10 deerstalkers in each level). After you have unlocked Mrs Hudson, you can use her key ability to open the living room with character customisation. After you have unlocked Irene Adler you can use her charm ability to open the front door. You can explore the street and use the mailbox on the corner to swap to specific characters