OK LOOK! All im doing this for is new players who dont know about this yet! Some people maybe arent that good at finding things ok! YOU on the other hand, just stfu! SO WHAT you know where it is?? OTHERS MAY NOT! GIVE IT A BREAK!
There are 3 hidden rooms:
Drawer, enter near window
2nd drawer, enter through roof and go through ceiling
Inside the bed: Go to the head of the bed
Under the house: Go to the equivalent of the roof entrance on the ground