Leo is frustrated that he can't say "good morning" to his friends. He's too short and gets lost in the crowd.

Leo thinks there must be a solution. He wants to greet his friends before they go into their classrooms.

Build a waving machine that Leo can use to say "good morning" to his friends.

Here's your challenge: create the program that starts the waving machine.

Create the program. It starts the waving machine.

Test your program.

Upgrade the program for the waving machine.

Design your own waving machine.