We will need the following variables for our game. Create each one and assign its starting value:

Once you've written the assignment statements, test the program by pressing the RUN button or by pressing CTRL+R on the keyboard. The program should run but have a blank screen - that's good! Otherwise if there is a typo it will give you an error message.

For part B we're going to make a countdown timer. The count variable starts at a random value and will count down to 0.

The PSEUDOCODE is:

• if count is greater than 0 then
  • subtract 1 from count, re-assign to the count variable
• print the count variable to the screen

This code will look like:

-- B. Countdown timer
if count > 0 then
 count = count - 1
end
print("Timer: " .. count, 5, 5)

When you run the program you will be able to see the number count down from the random value to 0. You can reset the program by hitting CTRL+R again.

Next whenever our counter hits 0 we're going to change what our critter is going. If the critter is hiding, we'll change it to showing. If the critter is showing, we'll change it to hiding. We will also reset our counter to a new random number so the critter acts in a cycle.

PSEUDOCODE:

• if count is 0 then
  • set count to a random number between 0 and 100
  • if status is "hide" then change status to "show"
  • else change status to "hide"
• if status is "hide", draw sprite 0
• else if status is "show", draw sprite 1
• else if status is "hit", draw sprite 2.

We haven't implemented logic for the "hit" status yet, but we will in a bit!

-- C. Critter updates
if count == 0 then
 count = math.random(10, 100)
 if status == "hide" then
  status = "show"
 else
  status = "hide"
 end
end

if status == "hide" then
 spr(0, moleX, moleY)
elseif status == "show" then
 spr(1, moleX, moleY)
elseif status == "hit" then
 spr(2, moleX, moleY)
end

Make sure to run the program and watch to make sure your critter changes from hidden to showing and back again. This should continue forever!

Next we will check to see if the mouse button was clicked, and if it was clicked, if the mouse (x,y) coordinate is above the critter. If it is, the critter shows the "hit" sprite, and we add 1 to the score!

PSEUDOCODE:

• Get the mouse x, y, and button state from the mouse() function.
• Get the distance between (mouseX,mouseY) and (moleX,moleY).
• If mouse button is clicked and the distance is less than 8 and the status is "show", then…
  • set status to "hit".
  • add 1 to score
  • play a sound effect
• Use print to display the score at the top of the screen

The code looks like this:

-- D. Check for mouse click on critter
mouseX, mouseY, button = mouse()
dist = GetDistance(mouseX,mouseY,moleX,moleY)
if button and dist <= 8 and status == "show" then
 status = "hit"
 score  = score + 1
 sfx(3,"C-4",10)
end
print("Score: " .. score, 180, 5)