I built Sudoku Fun4Kids – a child-friendly Sudoku app with Flutter for Android, iOS and Windows

HPWsoft — Sun, 13 Sep 2026 13:00:56 +0000

I recently released Sudoku Fun4Kids, a Sudoku and logic game designed specifically for young children.

Traditional 9×9 Sudoku can be too complex for beginners, so I reduced the concept to 4×4 and 6×6 boards and added three different ways to play:

😀 Emojis
123 Numbers
ABC Letters

The goal is to preserve the basic logic of Sudoku while making it approachable for children who may not yet be comfortable with traditional number puzzles.

Gameplay

Here is a short gameplay video showing the different modes and board sizes:

Designing for young children

The biggest challenge was not the Sudoku logic itself, but the interface.

I wanted children to be able to use the app as independently as possible, so I focused on:

large touch targets
a reduced interface
clear visual feedback
simple controls
a hint function when a child gets stuck
layouts that work across different screen sizes

Making an interface simpler for young users often required more work rather than less.

One Flutter codebase, three platforms

Sudoku Fun4Kids is built with Flutter and is available for:

Android
iPhone and iPad
Windows

Using Flutter made it possible to keep the interaction and visual design consistent across all three platforms.

For the iOS release workflow, I use GitHub and Codemagic for automated builds.

Privacy by design

I also wanted Sudoku Fun4Kids to follow a very simple product philosophy:

completely free
no ads
no in-app purchases
no tracking
no data collection
no user account required
fully usable offline

The Android version has also received the Teacher Approved designation on Google Play.

Try it

Screenshots and links to the Android, iOS/iPadOS and Windows versions are available here:

https://hpwsoft.com/sudoku_kids.html