### Please enable JavaScript to use CodeHS

Introduction to Computer Science in JavaScript (Collie)

#### Points

Activity Points
Programming with Karel
1.1 Introduction to Programming With Karel
1.1.1 Introduction to Programming With Karel 1
1.1.2 Karel Commands Quiz 5
1.1.3 Our First Karel Program 1
1.1.4 Your First Karel Program 5
1.1.5 Short Stack 5
1.2.2 More Basic Karel Quiz 5
1.2.3 Tennis Ball Square 1
1.2.4 Make a Tower 5
1.2.5 Pyramid of Karel 5
1.3 Karel Can't Turn Right
1.3.1 Karel Can't Turn Right 1
1.3.2 Karel Can't Turn Right Quiz 5
1.3.3 Tower and Turn Right 1
1.3.4 Slide Karel 5
1.3.5 Fireman Karel 5
1.3.6 Karel Turns Right Badge 1
1.4 Functions in Karel
1.4.1 Functions in Karel 1
1.4.2 Functions in Karel Quiz 5
1.4.3 Turn Around 1
1.4.4 Pancakes 5
1.4.5 Mario Karel 5
1.5 The Main Function
1.5.1 The Main Function 1
1.5.2 The Main Function Quiz 5
1.5.3 Tower with Main Function 1
1.5.4 Pancakes with Main 5
1.6 Top Down Design and Decomposition in Karel
1.6.1 Top Down Design and Decomposition 1
1.6.2 Top Down Design and Decomposition Quiz 5
1.6.3 Top Down Design and Decomposition in Karel 5
1.6.4 Hurdle Karel 1
1.6.5 The Two Towers 5
1.7.2 Commenting Your Code Quiz 5
1.7.3 Hurdle Karel 1
1.7.4 The Two Towers + Comments 5
1.8 Super Karel
1.8.1 Super Karel 1
1.8.2 Super Karel Quiz 5
1.8.3 Hurdle Karel (with SuperKarel) 1
1.8.4 The Two Towers + SuperKarel 5
1.9 For Loops
1.9.1 For Loops 1
1.9.2 For Loops Quiz 5
1.9.3 Repeated Move 1
1.9.4 Put Down Tennis Balls 1
1.9.5 Take 'em All 5
1.9.6 Dizzy Karel 5
1.9.7 Ball in Each Corner 5
1.9.8 Lots of Hurdles 5
1.10 If Statements and Conditionals
1.10.1 If Statements and Conditionals 1
1.10.2 If Statements and Conditionals Quiz 5
1.10.3 If Statements and Conditionals 1
1.10.4 Safe Take Ball 1
1.10.5 Is There a Ball? 5
1.10.6 Don't Crash! 5
1.11 If/Else Statements
1.11.1 If/Else Statements 1
1.11.2 If/Else Statements Quiz 5
1.11.3 If/Else Statements 1
1.11.4 Opposite Day 1
1.11.5 Right Side Up 5
1.11.6 Right vs. Left Square 5
1.12 While Loops
1.12.1 While Loops 1
1.12.2 While Loops Quiz 5
1.12.3 Move to Wall 1
1.12.5 Lay Row of Tennis Balls 5
1.12.6 Big Tower 5
1.13 How to Indent Your Code
1.13.1 How to Indent Your Code 1
1.13.2 How to Indent Your Code Quiz 5
1.13.3 Dance and Clean Karel 1
1.13.4 Diagonal 5
1.13.5 Staircase 5
1.14 Control Structures Example
1.14.1 Control Structures Example 1
1.14.2 Control Structures Example Quiz 5
1.14.3 Cleanup Karel 1
1.14.4 Random Hurdles 5
1.15 More Karel Examples and Testing
1.15.1 More Karel Examples and Testing 1
1.15.2 Move Tennis Ball Stack 1
1.15.3 Live Coding: Climbing Karel 1
1.15.4 Climbing Karel 1
1.15.5 Quiz: Which Control Structure? 5
1.15.6 Opposite Corner 5
1.16 Programming with Karel Quiz
1.16.1 Programming with Karel Quiz 5
Karel Challenges
2.1 Challenge Problems
2.1.1 Fetch 10
2.1.2 Racing Karel 10
2.1.3 Tower Builder 10
2.1.4 Super Cleanup Karel 10
2.1.5 Double Tennis Balls 10
JavaScript Basics
3.1 Hello World
3.1.1 Hello World 1
3.1.2 Hello World Quiz 5
3.1.3 Hello World 1
3.1.4 Your Name and Hobby 5
3.1.5 ASCII Animals 5
3.2 Variables
3.2.1 Variables 1
3.2.2 Live Coding: Variables 5
3.2.3 Variables Quiz 5
3.2.4 Basic Variables 1
3.2.5 Daily Activities 5
3.2.6 Debugging Variables 5
3.3 User Input
3.3.1 User Input 1
3.3.2 User Input Quiz 5
3.3.3 Basic User Input 1
3.3.4 Dinner Plans 5
3.4 Basic Math
3.4.1 Basic Math 1
3.4.2 Basic Math Quiz 5
3.4.3 Simple Calculator 1
3.4.4 Dollars to Pounds 1
3.4.5 Dividing Up Groups 1
3.4.6 T-Shirt Shop 5
3.4.7 Running Speed 5
3.5 Collaborative Programming
3.5.1 Pair-Programming 1
3.5.2 Pair-Programming 5
3.5.3 Why Practice Pair-Programming? 1
3.5.4 Pair-Programming Reflection 5
3.6 Random Numbers
3.6.1 Random Numbers 1
3.6.2 Random Numbers Quiz 5
3.6.3 Rolling a Die 1
3.6.4 Treasure Chest Loot 5
3.6.5 Multiplication Practice 5
3.7 Basic Functions
3.7.1 Basic Functions 5
3.7.2 Variables in Functions 5
3.7.3 Basic Functions Quiz 5
3.7.4 Function Flow 1
3.7.6 ASCII Karel 5
3.8 JavaScript Basics Quiz
3.8.1 JavaScript Basics Quiz 25
The Canvas and Graphics
4.1 Intro to the Canvas and Graphics
4.1.1 Intro to Canvas and Graphics 5
4.1.2 Debug Mode for Positioning 5
4.1.3 Live Coding: Circle and Rectangle 5
4.1.4 Canvas Coordinates 5
4.1.5 Canvas and Graphics Quiz 5
4.1.6 Creating a Circle 1
4.1.7 A Circle and a Rectangle 1
4.1.8 A Ball in a Box 5
4.1.9 Raise the Flag 5
4.2 More Graphics Objects
4.2.1 More Graphics Objects 5
4.2.2 Live Coding: More Graphics Objects 5
4.2.3 Graphics Objects Quiz 5
4.2.4 Cute Animals 1
4.2.5 Greetings, Earth! 1
4.2.6 Exploration: XY Plot 3
4.2.8 Saturday Mornings 5
4.3 Positioning Graphics Objects
4.3.1 Positioning Graphics Objects 5
4.3.2 Positioning Quiz 5
4.3.3 8 Ball 1
4.3.4 Color the Rainbow 5
4.3.5 Create Your Own Plant! 10
4.4 JavaScript Graphics Quiz
4.4.1 JavaScript Graphics Quiz 5
Graphics Challenges
5.1 Graphics Challenges
5.1.1 Ghost 10
5.1.2 Fried Egg 10
5.1.3 Draw Something 5
Control Structures
6.1 Booleans
6.1.1 Booleans 1
6.1.2 Booleans Quiz 5
6.1.3 Boolean Exploration 1
6.1.4 Do You Have a Dog? 5
6.1.5 Booleans are Questions 5
6.1.6 Best Day Ever 5
6.2 If/Else Statements
6.2.1 If Statements 1
6.2.2 If Statements Quiz 5
6.2.3 Are You Logged In? 5
6.2.4 Is It Raining? 5
6.2.5 Mood Playlist 5
6.3 Logical Operators
6.3.1 Logical Operators 1
6.3.2 Logical Operators Quiz 5
6.3.3 Light Switch 1
6.3.4 Harry Potter 1
6.3.6 Logical Operators Game 5
6.3.8 Switching Players 5
6.3.9 A Day of Decisions 5
6.4 Comparison Operators
6.4.1 Comparison Operators 1
6.4.2 Comparison Operators Quiz 5
6.4.3 Great Names 1
6.4.5 Even and Odd 1
6.4.6 Rolling Dice 5
6.4.7 Teenagers 5
6.4.8 Rocket Launch Requirements 5
6.4.9 Trivia Game 5
6.5 Graphics and Conditionals
6.5.1 Graphics and Conditionals 5
6.5.2 Circle or Rectangle? 5
6.5.3 Correct or Incorrect? 5
6.5.4 Else If Statements 5
6.5.5 Conditional Circle Color 5
6.5.6 Odd or Even Shapes 5
6.5.7 Graphics and Conditionals Quiz 5
6.5.8 Interactive Modern Art 5
6.6 While Loops
6.6.1 While Loops 1
6.6.2 While Loops Quiz 5
6.6.3 While Loop Countdown 1
6.6.4 Debugging: Best Name Ever 5
6.6.5 Level Up 5
6.6.6 Inventory 5
6.7 The Break Statement
6.7.1 The Break Statement 1
6.7.2 The Break Statement Quiz 5
6.7.4 Break Statement Reflection 5
6.7.5 Snake Eyes 5
6.7.7 Riddle Machine 5
6.8 While Loops and Graphics
6.8.1 While Loops and Graphics 5
6.8.2 Lots of Circles 5
6.8.3 Corners on Corners 5
6.8.4 Concentric Circles 5
6.8.5 Debugging: Circle Positions 5
6.8.6 Growing Squares 5
6.9 For Loops
6.9.1 For Loops 1
6.9.2 For Loop Exploration 1
6.9.3 Chalkboard 5
6.9.4 Count By Twos 1
6.9.5 Eating Apples 1
6.9.6 Countdown by Sevens 5
6.9.7 For Loops Quiz 5
6.9.8 Lives Left 5
6.9.9 For Loop Sum 1
6.9.10 Jukebox 5
6.10 For Loops and Graphics
6.10.1 For Loops and Graphics 5
6.10.2 Lots of Circles Revisited 5
6.10.3 Exploration: Confetti 5
6.10.4 Using i to Position Objects and Adjust Size 5
6.10.5 Horizontal Stripes #1: Using i to Adjust Position 5
6.10.6 Horizontal Stripes #2: Using i to Adjust Size 5
6.10.7 Debugging: Colorful Bullseye 5
6.10.8 Caterpillar 5
6.11 Javascript Control Structures Quiz
6.11.1 JavaScript Control Structures Quiz 25
Control Structures Challenges
7.1 Control Structures Challenges
7.1.1 Guessing Game 10
7.1.2 Landscape Generator 5
7.1.3 Exploring RGB Color Codes 5
Functions
8.1 Parameters
8.1.1 Parameters 5
8.1.2 Live Coding: Parameters 5
8.1.3 Parameters Quiz 5
8.1.4 Greetings 5
8.1.5 Slope of a Line 1
8.1.6 Draw Lots of Circles! 1
8.1.7 Area of Triangle 5
8.1.8 Rainbow Revisited 5
8.1.9 Cityscape 5
8.2 Return Values
8.2.1 Return Values 5
8.2.2 Return Values Quiz 5
8.2.3 Mathematical Returns 1
8.2.4 Offscreen Graphics 1
8.2.5 Max 5
8.2.6 Overlapping Graphics 5
8.2.7 Is It Even? 5
8.3 Default Parameter Values
8.3.1 Default Parameter Values 5
8.3.2 Default Parameter Values Quiz 5
8.3.3 Default Printing 1
8.3.4 Farming International 5
8.3.5 Compound Interest 5
8.3.6 Default Face 5
8.4 Variable Scopes
8.4.1 Variable Scope 5
8.4.2 Live Coding: Variable Scope 5
8.4.3 Variable Scope Quiz 5
8.4.4 Scope of X 5
8.4.5 Exploration: Scope of Ball 3
8.4.6 Scope Reflection 5
8.4.7 Choose Wisely Game 5
8.5 Functions Quiz
8.5.1 Functions and Parameters Quiz 5
Functions Challenges
9.1 Functions Challenges
9.1.1 Global Travel Assistant 10
9.1.2 Balloons 10
9.1.3 Ghost Invasion! 10
Final Project
10.1 Final Project
10.1.1 Brainstorm and Discuss 5
10.1.2 Planning 5
10.1.3 Pseudocode 5
Animation and Games
11.1 Timers
11.1.1 Timers 1
11.1.2 Timers Quiz 5
11.1.3 Moving Ball 1
11.1.4 Magic 8 Ball 1
11.1.5 Crazy Ball 5
11.1.6 Paint Splatter 5
11.1.7 Project: Evasion (Timers) 5
11.1.8 Project Info and Links 5
11.2 Stopping Timers
11.2.1 Stopping Timers 1
11.2.2 Stop Timer Quiz 5
11.2.3 Random Circles 1
11.2.4 Growing Circle 5
11.2.5 Brick Wall 5
11.2.6 Project: Evasion (Stop Timers) 5
11.3 Collisions
11.3.1 Collisions 1
11.3.2 Live Coding: Collisions 5
11.3.3 Collisions Quiz 5
11.3.4 Bouncing Ball 1
11.3.5 Collision Simulation 5
11.3.6 Carnival Game 5
11.3.7 Project: Evasion (Collisions) 5
11.4 Mouse Click Events
11.4.1 Mouse Click Events 1
11.4.2 Mouse Click Quiz 5
11.4.3 Click For Circles 1
11.4.4 Pausing the Carnival Game 5
11.4.5 Dripping Paint 5
11.4.6 Project: Evasion (Mouse Click) 5
11.5 More Mouse Events
11.5.1 More Mouse Events 1
11.5.2 More Mouse Events Quiz 5
11.5.3 Simple Painting 1
11.5.4 Painting with Color 1
11.5.5 Coordinates 5
11.5.6 Target 5
11.5.7 Drag and Drop 5
11.5.8 Project: Evasion (More Mouse) 5
11.6 Key Events
11.6.1 Key Events 1
11.6.2 Key Events Quiz 5
11.6.3 Keyboard Character 5
11.6.4 Basic Snake 5
11.6.5 Project: Evasion (Key Events) 5
11.6.6 Project Reflection 5
11.7 Animation and Games Quiz
11.7.1 Animation and Games Quiz 5
Animation Challenges
12.1 Animation Challenges
12.1.2 Increasing Number of Shapes 10
Project: Breakout
13.1 Breakout
13.1.1 Breakout Introduction 5
13.1.2 Bricks 10
13.1.4 Collisions 10
Practice: Karel
14.1 Extra Karel Practice
14.1.1 Functions Practice: K For Karel 10
14.1.2 Functions Practice: Karel Plants A Tree 10
14.1.3 Functions Practice: X Marks the Spot 10
14.1.4 While Loop Practice: Blackout 10
14.1.5 While Loop Practice: Move To Top 10
14.1.6 While Loop Practice: Checkered Row 10
14.1.7 For Loop Practice: Tall Hurdles 10
14.1.8 Functions and While Loop Practice: Row and Back 10
14.1.9 Functions and For Loop Practice: Opposite Squares 10
14.1.10 Stairway To Heaven 10
14.1.12 For Loop Square 5
14.2 Extra Karel Puzzles
14.2.1 Midpoint Karel 10
14.2.2 Target Karel 10
14.2.3 The Winding Yellow Road 10
14.2.4 Super Random Hurdles 10
14.2.5 Copy 10
14.2.6 Multiply 10
14.2.7 Fibonacci Karel 10
14.2.8 Comparison Karel 10
14.2.9 Swap 10
14.2.10 Sorting Karel 10
Practice: Functions
15.1 Functions and Parameters Practice
15.1.1 Taking a Power 10
15.1.2 Dot Rectangle 10
15.1.3 Print the Date 10
15.1.5 Concentric Circles 10
15.1.6 Graphics Staircase 10
15.1.7 The Weekend 5
15.1.8 Functions and Parameters Badge 0
Practice: Console Challenges
16.1 Prime Numbers
16.1.2 Voting Age 1
16.1.3 Negative Numbers 1
16.1.4 Fibonacci 5
16.1.5 Better Sum 5
16.1.6 Factorial 5
16.1.7 All Dice Values 5
16.1.8 Powers of Two 5
16.1.9 Prime Numbers 10
16.1.10 Find the Max 10
16.1.11 Prime Factorization 10
16.1.12 Fizz Buzz 10
16.1.13 Grid Printer 10
16.1.14 Number Sum 10
16.1.15 Hailstone Sequence 10
16.1.16 Pythagorean Triples 10
16.1.17 Digit Array 10
Practice: Graphics and Animation
17.1 Snake Game
17.1.1 A Growing Snake 10
17.1.2 Collisions 10
17.1.4 Finishing Touches 10
17.2 Fun Graphics Challenges
17.2.1 The Worm 5
17.2.2 Happy Birthday! 10
17.2.3 Balloons 10
17.2.4 Broccoli 10
17.2.5 Circles in Squares 10
17.2.7 Circles in Circles 10
17.2.8 Snowman Loop 10
17.3 Animation Practice
17.3.1 Random Ghosts 1
17.3.2 Spinner 1
17.3.3 Random Fireworks 1
17.3.4 Drawing Lines 1
17.3.5 Colorful Drag to Paint 1
17.3.6 Keyboard Square 1
17.3.7 Click For Ghosts 1
17.3.8 Circle Wall 5
17.3.9 Hotspot Ball 5
17.3.10 Trail 5
17.3.11 Teleporting Ball 5
17.3.12 Leash 5
17.3.13 Pause 5
17.4 Crazy Ball Game
17.4.1 Crazy Ball Game 1 1
17.4.2 Crazy Ball Game Quiz 1 5
17.4.3 Crazy Ball Game 1 1
17.4.4 Crazy Ball Game 2 1
17.4.5 Crazy Ball Game Quiz 2 5
17.4.6 Crazy Ball Game 2 1
17.4.7 Click for Collision 5
17.4.8 Drag and Drop 5
Extension: Visualizing Music
18.1 Visualizing Music
18.1.1 Visualizing Music 1
18.1.2 Our First Visualization 1
18.1.3 Vertical Bars 1
18.1.4 Vertical Bars with Color 1
18.1.5 Changing Circles 1
18.1.7 Changing Colors 5
18.1.8 Custom Colors 5
18.1.9 Create Your Own Music Visualization 5
Extra Quiz Questions
19.1 Basic Javascript and Graphics
19.1.1 For Loop Examples Quiz 5
19.1.2 Extra JavaScript Graphics Quesions 0
19.1.3 Extra Logical Operators Questions 0
19.1.4 Extra Functions and Return Values Questions 0
19.1.5 Extra Local Variables and Scope Questions 0
19.1.6 General For Loop Quiz 5
19.2 Animation and Games
19.2.1 Extra Timers Questions 0
19.2.2 Extra Bouncing Ball Questions 0
19.2.3 Extra Mouse Events: Mouse Clicked Questions 0
19.2.4 Extra Key Events Questions 0
19.2.5 Extra Crazy Ball Game Questions 0
19.3 Basic Data Structures
19.3.1 Extra Intro to Lists/Arrays Questions 0
19.3.2 Extra Indexing into an Array Questions 0
19.3.3 Extra Adding/Removing from an Array Questions 0
19.3.4 Extra Array Length and Looping Through Arrays Questions 0
19.3.5 Extra Iterating Over an Array Questions 0
19.3.6 Extra Finding an Element in a List Questions 0
19.3.7 Extra Removing an Element from an Array Questions 0
19.3.8 Extra Basics of Objects Questions 0
19.3.9 Extra Intro to Sets Questions 0
19.3.10 Extra Intro to Grids Questions 0
Extension: Arrays
20.1 Intro to Arrays
20.1.1 Intro to Arrays 5
20.1.2 When to Use Arrays? 5
20.1.3 Intro to Arrays Quiz 5
20.1.4 Array Basics 1
20.1.5 Exploration: A Boxy Array 2
20.1.6 List of Places to Travel 5
20.1.7 Top Websites 5
20.2 Adding & Removing from an Array
20.2.1 Adding & Removing from an Array 5
20.2.2 Adding & Removing from an Array Quiz 5
20.2.3 A Note About Arrays as Parameters 5
20.2.4 Temperature Array 1
20.2.5 Exploration: Creating a To-Do List 2
20.2.6 Stacking Barrels 5
20.2.7 Key Logging 5
20.3 Iterating Through an Array
20.3.1 Iterate Through an Array 5
20.3.2 Iterate Through an Array Quiz 5
20.3.3 Print Shopping Lists 1
20.3.4 Test Average 2
20.3.5 Reverse List 5
20.3.6 Evens Only List 5
20.3.7 Dice Roll Probabilities 5
20.3.8 Dice Probability Reflection 5
20.4 Array Iteration with Graphics
20.4.1 Array Iteration with Graphics 5
20.4.2 Array Iteration with Graphics Quiz 5
20.4.3 Snow Storm 5
20.4.4 Exploration: Changing Properties 2
20.4.5 Draw a Barcode 5
20.4.6 Wind Turbines 5
20.4.7 Parallax Challenge 5
20.5 Array Methods
20.5.1 Array Methods 5
20.5.2 Email List 5
20.5.3 Weekly Temperatures 5
20.5.5 Mutual Friends 5
20.5.6 Scientific Data 5
Extension: Objects
21.1 Intro to Objects
21.1.1 Intro to Objects 5
21.1.2 Intro to Objects Quiz 5
21.1.3 Phonebook 1
21.1.4 Movie Database 5
21.1.5 Object Literals & Properties 5
21.1.6 Car Objects 5
21.1.7 Two Player 5
21.1.8 Shopping Cart 5
21.2 Graphic Objects
21.2.1 Graphic Objects 5
21.2.2 A Note About Objects as Parameters 5
21.2.3 Super Bouncers 5
21.2.4 Falling Blocks 5
21.2.5 Exploration: Our Solar System 2
21.2.6 Fireflies 5
21.2.7 Firefly Reflection 5
21.2.8 Level 1 Knight 5
21.3 Object Methods
21.3.1 Object Methods 5
21.3.2 Object Methods Quiz 5
21.3.3 Party Ball 5
21.3.4 Exploration: Digi Pet 2
21.3.5 Level 2 Knight 5
21.3.6 Bank Account 5
21.4 Iterating Through an Object
21.4.1 Iterating Through an Object 5
21.4.2 Iterating Through an Object Quiz 5
21.4.3 Property or Method? 5
21.4.4 Phonebook Extended 5
21.4.5 Bouncing Emoji 5
21.4.6 Starry Night 5
21.4.7 Let's Go Birding 5
21.4.8 Asteroids 5
21.5 Object Constructors
21.5.1 Object Constructors 5
21.5.2 Object Constructors Quiz 5
21.5.3 New Person 5
21.5.4 CodeHS Graphics are Objects 5
21.5.5 Musical Instruments 2
21.5.6 Level 3 Knight 5
21.5.7 Bank Account Constructor 5
21.5.8 Hobby Constructors 5
21.5.9 Advanced Extension: Prototypes and Inheritance 5
22.1 Intro to Sets
22.1.1 Intro to Sets 1
22.1.2 Intro to Sets Quiz 5
22.1.3 Basic Sets 1
22.1.4 Vowels 5
22.1.5 Mutual Friends 5
22.1.6 Total Network of Friends 5
22.2 Intro to Grids
22.2.1 Intro to Grids 1
22.2.2 Intro to Grids Quiz 5
22.2.3 Grid Basics 1
22.2.4 Building a Database 5
22.3 Looping Over a Grid
22.3.1 Looping Over a Grid 1
22.3.2 Looping Over a Grid Quiz 5
22.3.3 Print Grid 1
22.3.4 Summing Grid 5
22.4 Grid Example: Get a Row
22.4.1 Grid Example: Get a Row 1
22.4.2 Grid Example: Get a Row Quiz 5
22.4.3 Get a Row 1
22.4.4 Grid Diagonal 5
22.4.5 Watercolor Grid 10
22.4.6 Data Structures Exercises Badge 0
Practice: Data Structures Challenges
23.1 Conway's Game of Life
23.1.1 Make The Grid 5
23.1.2 Find Life 5
23.1.3 Finish Up 5
23.2 Connect Four
23.2.1 Make The Board 5
23.2.2 Take Turns 5
23.2.3 Find the Winner 5
Project: Tic Tac Toe
24.1 Tic Tac Toe
24.1.1 Tic Tac Toe: Part 1 10
24.1.2 Tic Tac Toe: Part 2 10
24.1.3 Tic Tac Toe: Full Game 10
24.1.4 Tic Tac Toe Badge 0
Project: Helicopter Game
25.1 Game Design: Helicopter
25.1.1 Introduction to Helicopter 1
25.2 Basics
25.2.1 Moving the Helicopter 1
25.2.2 Moving the Helicopter 5
25.2.5 Smoother Movement 1
25.2.6 Smoother Movement 5
25.3 Improvements
25.3.1 Colliding with Walls 1
25.3.2 Wall Collisions 5
25.3.3 Colliding with Obstacles 1
25.3.4 Obstacle Collisions 5
25.3.7 Moving the Terrain 1
25.3.8 Moving the Terrain 5
25.4 Polish
25.4.1 Helicopter Image and Points! 1
25.4.2 Image and Points 5
25.4.3 Dust 1
25.4.4 Dust 5
25.4.5 More Obstacles 1
25.4.6 More Obstacles 5
25.4.7 Helicopter Extensions 10