for anyone con fused on the rat:
1: give smiling girl the paddles (found in safe behind blonde girl) and the ball (get plunger from under the coffee set up by clicking the cabinet and using on cloged toilet)
2: take key from her desk and use on door in south/lower part of main computer area to unlock
4: the mouse is in the room, then follow burnermailed instructions
(note: get money by using hammer on piggy bank)