A Scratch maze game is a fun school project that teaches coding, problem solving, and game design at the same time. Students build a maze, control a player sprite, and try to reach a finish line without touching the walls. The project is easy to start because Scratch uses colorful blocks instead of typed code.
It also helps students learn how games use rules, inputs, and feedback.
Key Facts
- Use arrow keys to change the sprite position: right changes x by + steps, left changes x by - steps, up changes y by + steps, and down changes y by - steps.
- A simple movement block can use: when right arrow key pressed, change x by 5.
- Wall collision can use: if touching color wall, then go back or return to start.
- The finish line can use: if touching color finish, then say You win! and stop all.
- Smaller step sizes like 2 or 3 make movement smoother, while larger step sizes like 10 make the sprite jump farther.
- Good maze games need a clear start, visible walls, a finish line, and code that prevents cheating through walls.
Vocabulary
- Sprite
- A sprite is a character or object in Scratch that can move, react, and run code.
- Backdrop
- A backdrop is the background image on the Scratch stage, such as a maze drawing.
- Event
- An event is something that starts code, such as clicking the green flag or pressing an arrow key.
- Collision Detection
- Collision detection is code that checks whether a sprite is touching another sprite or a certain color.
- Coordinate
- A coordinate is a number that shows a sprite's position on the stage using x for left and right and y for up and down.
Common Mistakes to Avoid
- Making the maze walls too thin, which is wrong because the sprite may slip through gaps or skip over the wall when it moves.
- Using a step size that is too large, which is wrong because the player can jump across narrow walls instead of colliding with them.
- Forgetting to reset the sprite at the start, which is wrong because the game may begin in the middle of the maze or at the finish line.
- Checking for the wrong wall color, which is wrong because Scratch will not detect the collision if the code color does not match the maze wall color.
Practice Questions
- 1 A Scratch cat starts at x = -180 and moves right by 5 each time the right arrow is pressed. What is its x-coordinate after 12 presses?
- 2 A player sprite moves 4 steps each key press. How many key presses are needed to move 60 steps across a straight hallway?
- 3 Your sprite sometimes passes through walls in your maze game. Explain two changes you could make to fix the problem and why they would help.