hello!

this is medium hard...

you could make a 2D array with math equation+ right answer or 2 parallel 1D arrays

1. // a quiz 
2. String[] questions = {
3.   "question 1", "question 2", "question 3", "question 4", "question 5"
4. };
5. String[] rightAnswer = {
6.   "answer Right1", "answer Right 2", "answer Right 3", "answer Right 4", "answer Right 5"
7. };    

Then have a class Cloud with an image and math equation and you load in setup() and steer its behaviour.
Probably arraylist of Cloud.

Have a function mouseClicked

1. void mouseClicked() {
2.   println("clicked");
3. }

and check if you clicked within a cloud

then get the answer from user, check equality


How to input an answer

1. //For user input dialogs
2. import javax.swing.JOptionPane;
3. void setup () {
4.   // do init here
5. }
6. void draw() {
7.   // do program here
8. }
9. void mouseClicked() {
10.   println("clicked");
11.   String y = JOptionPane.showInputDialog(null,
12.   "Your answer:",
13.   "Math question 3+7",
14.   JOptionPane.PLAIN_MESSAGE);
15.   println(y);
16.   if (y.equals("10"))
17.     println("Correct");
18.   else
19.     println("Wrong.");
20. }

If the answer is correct, the cloud disappears. If the answer is incorrect, the cloud turns red and the text changes to white.


Greetings, Chrisir