I have been playing this a lot, got to level 4, collected 11 cogs that let me into a house. Now in this house, I find 13/14 cogs needed to leave the house but that last cog is nowhere to be found. Upstairs there is a door that doesn't open, room 7 that needs the key, doesn't have anything in there. So I am wondering if this is a glitch or I really am just not seeing where that last cog is....