This is a fun way students can review content either collaboratively or individually. Students work through a series of puzzles to determine a 3 digit combination to finish the activity. This activity can be done without an actual box and lock, but it is more fun for the students and I share an inexpensive way to create the boxes.

The topics covered in this activity:

1. Computer science vocabulary (crossword puzzle)

2. Code tracing using pseudo code. (sequence, selection, iteration and lists)

3. Boolean operators and logic gates

4. Flowcharts

5. Number systems (binary & hexadecimal)

If you are using this for AP Computer Science Principles, Big Ideas 1 - 3 are covered.