Step 1: Materials
2 Paper Sheets for Concertinas: 5" x 12" each
6 card Stock Pages: 5" x 7" each
2 Arduino Unos
2 9V Batteries
2 Battery Holders
Step 2: Print & Crop Your Book
After you crop all pages, you need to assemble all of them into concertinas with glue. Remember the order and don't shuffle your layers.
For more info about making tunnel books, go to https://www.instructables.com/id/How-to-make-a-Tunnel-Book/
Step 3: Code Your Arduino & Assemble It
Wire should be need for extension of LEDs. It's impossible to put your LED into the book because LED's legs are too short. Get long wires and combine them to legs by soldering.