You will need to find which cards lead you to the doctor’s research lab.

What do you notice about the cards? Is there anything that would potentially connect those cards?

There are letters on the top right corner of each card. Using the pathways, can you spell out a word?

The lock is four letters long, so you know that you are looking for a four letter word.

The pathway begins with card 4, so the word begins with “M”.

Put the solution into the lock!

The correct pathway to the research lab is 04 (M) to 24 (I) to 02 (N) to 14 (D). Giving you the word MIND.