This Instructable will teach you how to make a rock-paper-scissors game with cardboard. The system features three buttons - each of the three moves available - on both sides. When a button is pressed, a slip of paper showing your move will pop up.
Get your supplies and let's get started!

Supplies

Lots of Cardboard
Pencil
Paper
Ruler
Boxcutter, knife or scissors
Brass paper fasteners

Step 1: Frame

This starts on a simple eight-by-six inch cardboard base with one-inch walls on all sides. Don't glue the walls to the base yet.
Make sure that your edges are even and that the cardboard is sturdy.

Step 2: Hinges and Buttons

The hinges for the game buttons are basic cardboard strips with brass paper fasteners. Cut six of each of these strips: lengths of one inch, two inches and four inches. All of them are one half inch wide. The buttons can be simple squares or as intricate as you want, as long as they don't obstruct the hinge system. Make sure you make six hinges.

Step 3: Frame - Part 2

After having put together the hinge and button system, add two strips of cardboard onto the base. Make them equidistant. These will keep the hinges from tangling.
Having done this, put on more strips of cardboard to build the frame up around the game. Cut slots for the buttons to stick out, as will as the hinges.

Step 4: Finishing Up

Once the frame is completed, apply squares of paper to the buttons to designate what does what. Cut slots in the hinges, and then put in slips of paper with rock, paper, and scissors drawn on them. Make sure the paper and buttons align. Put a three-month tall place of cardboard in front of the buttons to discourage cheating.

Step 5: Done!

Congratulations! You have successfully created a rock-paper-scissors game out of cardboard. Mine worked, but instead of pushing the buttons, you had to pull them back, like levers. You could potentially create several variations of this, and I look forward to seeing photos of your own creations!
Enjoy your cardboard rock-paper-scissors!