When you start exploring the Raccoon City Police Station you’ll notice that some doors have special symbols on them. These symbols include Diamond, Club, Heart and Spade. The Spade Key should be the first key that you run into when you start out in Resident Evil 2 and will start literally opening doors to expand your progress.
The Spade Key is located on a desk on the third floor right near the stairway that runs all the way from the first floor darkroom. The Spade Key will allow you to open shortcuts between the West Office and Main Hall as well as shortcuts from the Waiting Room into the a new area with the Fire Escape and Art Room.
Once you do get the Spade Key things do start to open up a bit for your in Resident Evil 2. This will allow for more puzzle opportunities, some new shortcuts, and new items that will increase the number of places that you can go.
While you’re up on the 3F getting the Spade Key. Don’t forget to stop at the locker right next to it and pick up the loot locked away in it using this code.