Where is the Master Key?

Well weres the teddy thats the good one in a room were theres 3 boxxes on when you go down to the basement

Tools and keys could be in any number of locations, and change from game to game, check out this list of possible locations here: https://www.appgamer.com/granny/strategy-guide/tool-locations

If you're playing the newer version of granny 1, then the master key can be in the melon or in the playhouse. Because it's one of the most important ways to escape, they limit the hiding places for it, so it's usually only in these places.

Master key is in under bed where you are