This type of puzzle is called a Cryptogram. This product includes 20 puzzles. Each puzzle has a key that lists all the letters from A thru Z with a box below. Each letter has a corresponding number. Below that is a phrase with blanks. Each of the blanks has a number underneath it. Students will fill in the letters that correspond to the numbers below the blanks to solve the phrase.
Each secret phrase is a line/lyric from a popular Christmas Carol. This is a perfect activity around Christmas time to keep students engaged and thinking critically!