In Coding Adventure and Banana Tales, a lock sign will appear in several challenges throughout the courses. This will happen in challenges where the user is asked to write the code only in a specific line in the editor screen. Other lines of code will not be editable, and when attempting to edit - the lock symbol will appear.
Along with the lock, you will see a rectangle in one of the lines, in order to guide you towards the line in which the code should be written.
You can only write your code in the rectangle box.