2- Basic Scratch Activities

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Use the slides below to make small games in Scratch.

1 – Move the Cat with UP DOWN LEFT RIGHT keys

This activity will teach you how a computer knows to move your character.

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Drag a Green Flag Event Block from the Events (Yellow). Drag a Forever Loop from Control (Orange) Drag in 4 If-Then Statements inside the Forever Loop You will be checking 4 Statements as long as the game is running.
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From Sensing (Light Blue), pull in 4 “Key ____ pressed?” blocks into each If statement. Change each to UP, DOWN, LEFT, RIGHT
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To move on a screen, Y represents numbers that go up and down. X represents numbers that go left and right. From Motion, add in the Change X and Change Y blocks. Put them in the right place or the cat won’t work right. Put a ( – ) negative sign in front of the 10 for down and left.
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Finally add these blocks to turn the cat in the direction it is moving. These commands tell Scratch to flip the image.

2 – Dodgeball

This activity will help you learn how to have objects sense they are hitting each other.

step1
Add a Ball sprite in by clicking the blue cat head with a plus button. Inside the script of the ball, place a Flag block on top of a Forever block.
step2
Now we will make the ball move and bounce. First place in a Move 10 steps block. Under that put a IF ___ Then block. Inside the IF, put If on Edge, Bounce and then turn 15 degrees. This code tells the ball always be moving a bounce off the walls.
step3
Right click the ball and click duplicate. This will copy the ball and its code.
step4
Place on the cat this code. This makes the cat always follow your pointer.
step5
Under that code, place these three sections, one for each ball that could hit the cat. If a ball hits the cat, it will say game over and end the code. This means the cat will no longer follow your pointer.

3- Tickle the Bat

In this activity, you will learn how variables can help you create a score and timer.

Astep1
Delete the cat and put in the bat. Place in these blocks. The first will animate your bat by rotating through its costumes. The second tells the bat to move around randomly.
Astep2
Click the orange circle Variables. Click the button at the top that says Make a Variable. Name one Score and the other Timer. Leave the option at “For all sprites”
Astep3
Add in these two blocks of code. The first starts the game by setting score to 0 and Timer to 30. The second block checks if you still have time. If you still have time and you click the bat, you add to your Score.
Astep4
Last of all, the Timer needs to count down so we add this last block. Using the Repeat block for 30 times, you wait one second then take away 1 from the Timer. Play the game and see how high you can score!
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