Why I built Animal Sudoku without a single ad

Anatolii Ganchev — Mon, 21 Sep 2026 21:27:40 +0000

Screen time for children is broken. Most free games trade a childs focus for ad revenue. Flashing banners and loud interruptions shatter concentration during critical learning moments. I built Animal Sudoku Kids Puzzle to be a safe haven for logic.

The problem that bothered me

If you've ever handed your phone or tablet to a child, you know the script:

A "free" puzzle game opens with a 30-second video ad.
A flashing "UPGRADE NOW" button takes up a third of the screen.
A pop-up appears mid-game asking the child to rate the app.
And somewhere, quietly, an SDK is collecting behavioral data on a 5-year-old.

I'm a parent. I'm also an engineer. The combination made me increasingly uncomfortable with what I was seeing — apps designed to capture and monetize children's attention rather than support their development.

I kept thinking: the technology to do this better has existed for a decade. Why isn't anyone just… doing it?

So I built it.

What Animal Sudoku is (and isn't)

It's a kid-first introduction to Sudoku, with three difficulty levels — a gentle 4×4 grid for beginners, a harder 4×4 for the in-between phase, and a proper 6×6 for puzzle-loving 8+ year olds. Six animals, color-coded zones, smart hints when stuck, auto-save so progress is never lost, gentle background music, and a confetti celebration when you finish a puzzle.

There is no "Game Over." There's no time pressure unless the child wants to chase a score. There's no failure state — just exploration.

What it isn't:

❌ No advertising. None. Anywhere.
❌ No third-party analytics or tracking SDKs.
❌ No account creation or sign-up.
❌ No internet connection required to play.
❌ No "watch a video to unlock" mechanics.
❌ No data collected from your child. None. The app is fully COPPA-compliant by virtue of collecting nothing.

The full game is free. There are no required purchases. Future optional theme packs may exist, but the core game stays complete and free forever.

Engineering for Every Child: Accessibility first

Inclusion was not a nice-to-have feature. It was a core requirement from day one. I spent a significant portion of development time ensuring that children with different physical or visual needs could play independently.

VoiceOver and TalkBack Support: Every animal icon and grid cell contains a semantic accessibility label.
Voice Control: Children can navigate the board and place animals using only their voice.
Haptic Logic: I integrated haptics to provide tactile vibrations for every move, allowing children to feel the logic of the game.
Visual Clarity: Large touch targets and high-contrast color zones ensure the interface is easy to navigate for small hands.

If you have small humans in your life

I'd love for you to try it. It's on the App Store, completely free, with no strings attached:

🔗 Download Animal Sudoku on the App Store

If you give it a spin with a kid in your life, I genuinely want to hear how it goes — what worked, what didn't, what you wish it did. Reply here, send me a message, or email me directly. Every bit of feedback shapes what comes next.