The National Cipher Challenge is a puzzle game where you have to solve a bunch of puzzles using special codes. The puzzles have to be solved using either the letters of the alphabet or a set of numbers. The puzzles can be anything from a word search to math problems. When you solve the puzzles correctly, it will give you a message or clue that will help you to solve the next puzzle. The goal of the game is to figure out the secret code that solves all of the puzzles!