6. Shared Score

This isn’t a game for just you!

This video will show you how to add an object for your friend to catch, as well as a special bonus object that you and your friend will catch together.

The yellow star works a lot like the blue star, so you can just copy the code.

Drag the code from the blue star to the yellow star in the sprites area.

That saved a lot of time and effort because now you just need to change a few things, rather than creating a new stack of code.

When the yellow star touches the blue Android, the score should go down, so change that value to negative 1.

When the yellow star touches the yellow Android, the score should go up, so make that value positive 1.

Click the green flag to test the code.

If you catch the yellow star with the blue Android, then the score will go down.

If you catch the yellow star with the yellow android, then the score will go up.

Finally, program the object that both you and your friend need to catch at the same time: the green star.

This object will make clones and fall just like the others, so drag the code from the yellow star to the green star.

This sprite’s scoring will differ from the scoring for the other stars.

Remove the two “if” statements that involve scoring.

The green star will score if both the Androids touch it.

Scratch offers a block for that.

From the control menu, drag out a new “if” block.

From the operators menu, select an “and” block, and place it inside the if block.

From the sensing menu, drag out two “touching” blocks, and place them on each side of the “and” block.

Click the dropdown to check that it says “blue Android” on one side and “yellow Android” on the other.

Finally, program what should happen when this object touches BOTH sprites.

The score should change.

This object is harder to catch than the others, since it requires you and your friend to work together, so it should probably increase the score more than the other objects.

This example uses 5, but you can use whatever value you like for your game.

Place the “if” statement inside the forever loop to make the clone run it.

Finally, delete the green star clone after it scores.

From the control menu, drag out the “delete this clone” block, and place it under the “change score by” block.

Test the code.

If only the yellow Android touches the green star, nothing happens.

If only the blue Android touches the green star, nothing happens.

If both the blue and yellow Android touch the green star, the score goes up!

Awesome!

Feel free to tinker with the values.

For example, maybe the green star should wait longer than the other two stars before falling.

That will complete your project.

If you need help,ask a neighbor.

Make your CS First experience more social and fun by sharing what you created today with the Scratch community.

Before you go, hit the “share” button and write a description of your project so others on Scratch can enjoy it.

Now it’s your turn: Program the yellow star to work similarly to the blue star by copying the blue star’s code and changing the necessary values.

Copy the code from the blue star to make the green star fall.

Check if both Androids are touching the green star using “if” “and” and “touching sprite” blocks.

Finally, make the green star react to touching both Androids by changing the score and deleting the clone.