Duplicate your ‘red’ dot sprite twice, and name the two new sprites ‘yellow’ and ‘blue’.
Change the costume of each new sprite so it is the correct colour: the ‘yellow’ sprite should be yellow, and the ‘blue’ sprite should be blue.
Change the code of each sprite so that the player has to match dot clone to the correct colour on the controller to score points.
If you play the game now, you can see that the dots sometimes get created on top of each other.
Change the code for the ‘yellow’ dot sprite so that it waits four seconds after the flag is clicked before appearing.
Then change the code for the ‘blue’ dot sprite so that it waits 6 seconds after the flag is clicked before appearing.