I made a very simple game for the kids today. We have some Montessori 3 part cards, but they had a little too much info on them for my younger DD. She is struggling with remembering the capitals, and I didn't want to overwhelm her with more info. So, I made a very simple version.
I pulled out index cards. I took a sharpie and wrote the capital on half the card and the state name on the lower half of the card. I wrote them in the same color, but in hindsight probably should have written them in differing colors. After having written them in the same color I needed some way for it to be easy for the kids to differentiate between which group was which in order to sort the cards before playing. I put a large star on the back of the capital cards (tie in to how capitals are represented on most maps), as well as a small star next to the name of each capital on the front of the card. This way as they pull them out of the container they can sort them quickly.
Then it's just a matching game. Match the capital card with the state card. Again, I have some great montessori 3 part cards that we will use later, but for my younger DD these are great for right now.