Day 18: Clones

Hide the Original and Create a Clone Factory

The original sprite shouldn’t be visible — it just makes clones. Delete all the existing code on your falling object sprite and replace it with this:

when green flag clicked
hide
forever
  wait (pick random (0.5) to (1.5)) seconds
  create clone of [myself v]
end

This creates a new clone every 0.5 to 1.5 seconds. The original stays hidden the whole time.

Write the Clone Code

Add a second script on the same sprite. This code runs on each clone when it’s created:

when I start as a clone
go to x: (pick random (-200) to (200)) y: (180)
show
repeat until <(y position) < (-170)>
  change y by (-3)
  if <touching [Player v]?> then
    change [score v] by (1)
    delete this clone
  end
end
delete this clone

Walk through this in your head:

1. The clone appears at a random x position near the top of the stage.
2. It falls 3 pixels per frame.
3. If it touches the player — score goes up, clone is deleted.
4. If it reaches the bottom without being caught — clone is also deleted.

Test It

Click the green flag. You should see multiple objects falling at the same time, each at its own random position. Catch them — the score should increase.

Create a Danger Sprite

Create a new sprite called Danger. Draw something the player should avoid — a rock, a bomb, a red X, a spiky ball. Keep it about 30x30 pixels.

Set Up the Clone Factory

Add the same factory pattern to the Danger sprite:

when green flag clicked
hide
forever
  wait (pick random (1) to (3)) seconds
  create clone of [myself v]
end

Write the Danger Clone Code

The danger clones fall the same way, but instead of increasing the score, they end the game:

when I start as a clone
go to x: (pick random (-200) to (200)) y: (180)
show
repeat until <(y position) < (-170)>
  change y by (-4)
  if <touching [Player v]?> then
    stop [all v]
  end
end
delete this clone

For now, touching a danger clone just stops everything with stop [all v]. Tomorrow you’ll replace this with a proper game-over screen.

Test It

Click the green flag. Both types of objects should fall — catch the good ones, dodge the bad ones. Touching a danger object should stop the game.