MIT Scratch

03. Ghostbusters
9 Topics
3.01 Introduction
3.02 Animate a ghost
3.03 Random ghosts
3.04 Challenge: more randomness
3.05 Code for catching ghosts
3.06 Challenge: add a sound
3.07 Add a score
3.08 Add a timer
3.09 Challenge: more sprites
04. Chatbot
8 Topics
4.01 Introduction
4.02 Your chatbot
4.03 A talking chatbot
4.04 Challenge: more questions
4.05 Making decisions
4.06 Challenge: more decisions
4.07 Changing location
4.08 Challenge: finish your chatbot
05. Paint box
7 Topics
5.01 Introduction
5.02 Make a pencil
5.03 Coloured pencils
5.04 Challenge: more pencils
5.05 Undo mistakes
5.06 Change the pen width
5.07 Challenge: keyboard commands
06. Boat race
9 Topics
6.01 Introduction
6.02 Getting started
6.03 Controlling the boat
6.04 Crashing!
6.05 Winning!
6.06 Challenge: sound effects
6.07 Adding a timer
6.08 Obstacles and boosters
6.09 Challenge: improving your game
07. Tech Toys
7 Topics
7.01 Introduction
7.02 Spinning Bow Tie
7.03 Challenge: Colour-changing sunglasses
7.04 Powering up your helicopter
7.05 Flying your helicopter
7.06 Loop-the-loop
7.07 Challenge: Create your own tech toy!
08. Balloons
9 Topics
8.01 Introduction
8.02 Animating a balloon
8.03 Random balloons
8.04 Challenge: More randomness
8.05 Popping balloons
8.06 Adding a score
8.07 Lots of balloons
8.08 Adding a timer
8.09 Challenge: More objects
09. Beat the goalie
7 Topics
9.01 Introduction
9.02 Moving the football
9.03 Was it a goal?
9.05 Adding a timer
9.06 Challenge: adding a score
9.07 Control the goalie
9.08 Challenge: manual control
SCRATCH GOLD II
01. Memory
7 Topics
1.01 Introduction
1.02 Create a colour sequence
1.03 Add sound
1.04 Repeat the sequence
1.05 Multiple levels
1.06 High score
1.07 Challenge: improve your game
02. Dodgeball
11 Topics
2.01 Introduction
2.02 Character movement
2.03 Challenge: completing the level
2.04 Gravity and jumping
2.05 Challenge: better jumping
2.06 Dodging balls
2.07 Challenge: random balls
2.08 Lasers!
2.09 Challenge! Challenge: more obstacles
2.10 Challenge: improved gravity
2.11 Challenge: more lives
03. Brain game
10 Topics
3.01 Introduction
3.02 Create questions
3.03 Add a timer
3.04 Challenge: add a score and reactions
3.05 Multiple games
3.06 Challenge: create a start screen
3.07 Add graphics
3.08 Challenge: sound and music
3.09 Challenge: race to 10 points
3.10 Challenge: instruction screen
04. Catch the dots
8 Topics
4.01 Introduction
4.02 Create a controller
4.03 Gain points or lose lives
4.04 More dots
4.05 Increase the difficulty
4.06 Challenge: faster dots
4.07 High score
4.08 Challenge: improve your game
05. Clone wars
11 Topics
5.01 Introduction
5.02 Make a spaceship
5.03 Lightning bolts
5.04 Challenge: improve the lightning
5.05 Space-hippos
5.06 Spaceship explosion
5.07 Hippos that disappear
5.08 Challenge: lives and score
5.09 Space-bat
5.10 Game over
5.11 Challenge: improve your game
06. Create your own world
13 Topics
6.01 Introduction
6.02 Move the player sprite
6.03 Solid walls
6.04 Move around your world
6.05 Move around your world
6.06 Challenge: move back to the previous room
6.07 Signs
6.08 Challenge: treasure!
6.09 People
6.10 Challenge: add an enemy
6.11 Collect coins
6.12 Doors and keys
6.13 Challenge: extend your world
07. Synchronized swimming
08. Scratch Cat Goes Skiing
09. Archery
10. Sprint!
SCRATCH GOLD I
01. Space Defender (Create without guides)
02. Cats
03. Flower generator
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2.07 Challenge: random balls

MIT Scratch 02. Dodgeball 2.07 Challenge: random balls

The balls that your character has to dodge all look the same, and they appear at regular three-second intervals. Can you add code to your game so that the balls:

  • Don’t all look the same?
  • Appear after a random amount of time?
  • Are a random size?
screenshot
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