I explored the map and found 3 remaining secret items/gifts
Once you found all the 4 secret items/gifts, a message will pop up saying "a secret door has opened"
The secret door is the vent located outside of the red spawn.
If you touch the vent it will open and if you enter it, you will be teleported to sewers where you have to navigate to find a blue ghost.
Beware: There's an hungry fish living in those sewers
Once you found the blue ghost, move into it and you will be teleported to VIP Area.