Algodoo

Step 1: cut the skin, and lift it out of the way.
Step 2: break the skull with the hammer next to the new brain.
Step 3: cut the eye off the brain (make sure not to cut the eye) remove the brian, then pit it in the machine.
Step 4: grab the new brain and put it in the skull CAREFULLY.
Step 5: close up the skin, and put a bandaid to seal the skin shut with the brush tool.