8 digit code in the locker is SPOILER DO NOT READ IF YOU WISH TO SOLVE ON YOUR OWN 84039410 and the running from the black slime keypad is the numbers starting from the most smeared in blood to the least smeared, to give your blood there is a cupcake in one rat hole with a note that says rat food, take the cupcake and put it in the hole where you hear squeaking from and the rat should bite you, in each of the unlockable rooms there are tools to unlock the next one, such as an axe or shovel, in the lab with the medical locker use the silver key to unlock the cabinets lowest drawer then press the button