This package includes two code-cracking activities - a treasure hunt and a riddle uncovering activity. The treasure hunt is ideal for students who like to get out of the classroom, and the riddle uncovering activity is suitable if you're short on time.

Before the students are able to complete either activity, they must solve 26 linear equations to uncover the code for each letter of the alphabet. These equations vary in difficulty so I encourage students to work collaboratively and check their answers with each other.