Build a Mini Coding Game in Scratch Jr: A Fun DIY Project for Young Creators
Introducing kids to the world of coding doesn’t need to be complicated. In fact, with tools like Scratch Jr, children can learn programming concepts through games they design themselves. One of the best beginner-friendly activities is creating a mini coding game where a character collects stars while avoiding obstacles. It’s simple, exciting, and provides just enough challenge to spark creativity and logical thinking.
This guide walks through the full process — from designing the game world to programming interactions, special effects, and gameplay rules. By the end, kids will have transformed Scratch Jr into their own little game studio.
Getting Started: Preparing the Game World
The first step is launching the Scratch Jr app and opening a new project. Kids will see an empty stage along with the default cat character. They can either keep the character or replace it with any sprite they prefer — a hero, an animal, a robot, or even a custom character they draw themselves. This main character will be controlled by the player.
Next comes setting up the game environment. Scratch Jr includes many backgrounds, from outdoor fields to underwater scenes and cityscapes. The background helps set the tone for the adventure. A forest setting might make the game feel like a treasure hunt, while a space setting could make collecting stars feel perfectly natural.
Once the background is chosen, kids can add star sprites from the library. These stars will be the collectible items in the game. They can also add obstacle sprites — like rocks, crabs, fences, machines, or anything else that fits the story. These obstacles represent danger and add excitement to the gameplay.
Because this is a game and not just a story, kids need to think about how the character will move and interact. The real fun begins when they start programming how objects behave.
Setting Up Star Collectibles and Interaction
To make the game more dynamic, kids can program the stars to appear and disappear throughout the scene. A simple approach is to use hide and show blocks. By starting with the star hidden and then telling it to show up at a certain moment, kids create a collectible effect. Assigning a tap interaction makes the star disappear when touched, simulating the idea of collecting.
Children can take this a step further by making the stars pop up in different places. One strategy is to duplicate the star sprite and place copies around the stage. Another is to move a star to different positions using movement blocks before it shows. This encourages experimentation and gives kids a deeper sense of control over how the game evolves.
The main character can also respond to touch through the start-on-tap block. Instead of coding automatic movement, Scratch Jr allows the creator to let the player tap the character to make it move, jump, or dodge. These interactions turn the project from a story into a game, making the experience more engaging.
For example, tapping the character could make it hop upward, allowing it to avoid an obstacle. Or tapping might make the character move to the right, helping it reach a nearby star. Kids can play around with different combinations to see what feels fun.
Adding Obstacles and Challenges
A game becomes more immersive when there’s a challenge — something to avoid or something that sends the character back if they make a mistake. ScratchJr includes a reset-position block, which is perfect for this purpose.
Obstacles can be programmed so that when the character touches them, the character resets to the starting point. This adds a sense of consequence and teaches beginning programmers the concept of cause and effect.
For instance, if the character is supposed to navigate through a row of moving crabs, touching any one of them would send the hero back to the beginning. This gives kids a reason to avoid obstacles, making the game more strategic.
Another exciting idea is coding obstacles to move on their own. Kids can use movement blocks and loops to make something slide back and forth across the stage. This transforms a simple object into an active threat rather than a stationary barrier. Moving obstacles enhance the gameplay and introduce an early understanding of loops and automated actions.
Using Blocks to Bring the Gameplay to Life
Scratch Jr works with block-based instructions, and this mini-game makes great use of several basic block types.
The start-on-tap block allows the player to control the character. This block teaches kids about responding to player input, helping them think like game designers.
Hide and show blocks are used to manage visibility of the stars. They help explain the concept of state — whether an object is visible or not.
The reset-position block is used for obstacles and teaches consequences and event-driven programming. It helps kids understand that certain interactions should trigger specific responses.
Movement blocks such as jump and directional motion bring action to the game. Kids can program small hops, long jumps, or simple side-stepping movement to help the character navigate the world. These blocks help children understand sequencing — how ordering steps in the right way produces the desired outcome.
When these blocks are combined carefully, kids begin to see how games work beneath the surface. They’re no longer just players — they’re creators.
Testing, Tweaking, and Improving
Once the basic game mechanics are in place, the next step is testing. Kids love this part because they get to play their own creation. They may notice things like:
The star appears at the wrong time
The obstacle is too easy or too difficult to avoid
The character’s movement is too slow or too fast
Encourage them to fix these issues by adjusting blocks. Maybe the star should appear earlier. Maybe the obstacle should move with fewer or more steps. Maybe the character needs a bigger jump.
This trial-and-error process teaches problem solving and refinement — key skills for coding and design. Kids start thinking like developers as they modify parts to improve the overall experience.
Turning Scratch Jr into a Mini Game Studio
By the end of this project, children will have gained insight into the fundamentals of interaction, sequencing, object behavior, loops, and event-based triggers — all through a simple game they built themselves. Scratch Jr transforms from a storytelling app into a mini game-building platform, giving kids a deeper sense of accomplishment and creativity.
This project encourages them to go beyond watching and start creating. With each change, they gain confidence and curiosity, paving the way for more advanced coding in the future. Whether they continue building more levels, adding score counters, or inventing entirely new game ideas, Scratch Jr becomes a playground of possibilities.
