Checklist

Start a new, empty, project and delete the cat

• Open the Scratch Editor

  You can find the online Scratch editor at icomp.site/scratch

• Change the backdrop to

• To add a ghost, click Select the sprite

• Give the ghost the name Ghost1

• You should now create a variable that controls how fast the ghost moves
• We can use this later to change the speed when the game is over

• In the Code section choose the Variables category

• Now click the button

• Name the new variable and check For this sprite only

• On the stage, you will see the variable is called

• Uncheck the box next to the variable so that it does not appear on scene:

• We want the ghost to move when the game starts. We can do this by creating the following script:

when green flag clicked
    set [speed v] to [5]
    forever
        move (speed) steps
    end

Checklist

• To prevent the ghost from getting stuck in the edge, we must make it turn when it hits it
• We can do this adding the block if on edge bounce
• The script then looks like this:

when green flag clicked
        set [speed v] to [5]
        forever
            move (speed) steps
            if on edge bounce
        end

• To stop the ghost from turning upside down, click on the box above the figure
• Select the middle rotation mode

Checklist

Let's make the ghost appear and disappear!

• We will now create a new script, which will run at the same time as the script as moving on the ghost

• The new script shows the ghost for a random amount of time and then hides it again after a random time

  when green flag clicked
    forever
      show
      wait (pick random (3) to (5)) secs
      hide
      wait (pick random (2) to (4)) secs
  end
  

Checklist

• Go to the Sounds tab, add a new sound

• Search for the sound Fairydust in the search field and select it

• Now create a script that will make the ghost disappear when the player clicks it

  when this sprite clicked
       hide
       start sound [fairydust v]
  

Checklist

Add score and a time limit

• Create a new variable called score

• Make sure this one applies For all figures

• Now add a new block so that the score variable is increased by 1 point each time the player clicks the ghost

  when this sprite clicked
        hide
        start sound [fairydust v]
        change [score v] by (1)
  

• Next create a new variable called time. This variable can show on the screen

• Now add a new script that sets the time variable to 30 and the score variable to 0 when the green flag is clicked.

• Then use a repeat until block to wait for 1 second before reducing the time by 1 second

• This should run until time runs out

• When the time runs out, you should stop the game with stop all

When green flag clicked
  set [time v] to [30]
  set [score v] to [0]
  repeat until <(time) = [0]>
      wait (1) seconds
      change [time v] by (-1)
  end
  stop [all v]