About the Madderverse
The Madderverse is a growing collection of free, ad-free games for kids, made by independent developer Onion Madder and published by Mad Sundar LLC. Every game plays instantly in any web browser — nothing to install, no sign-up required — and several titles are also available as apps on Google Play.
The catalog spans creative tools and arcade play: a 3D pottery wheel (Slip Studio), a clay studio with glazes and a kiln (Pootery), a beat-making toy (All Munkis), a draw-and-dance maker (Groodle), a swallow-the-world hole game (Hole-Up), a glass-smashing carnival game (Glass Gallery), and more.
Our Promise
The Madderverse is built the way console games used to be: buy or open it once and you get the whole thing. The Madderverse Promise binds every game we make:
- No ads. Ever. No banners, no video ads, no interstitials, no sponsored content.
- No in-app purchases that gate play. Players never pay for more time, more moves, more lives, or more colors to keep playing. Where optional paid packs exist (Pootery), they are cosmetic only and never block the core game.
- No subscriptions. Any purchase is one-time. You own it forever.
- No tracking. No third-party advertising trackers, no profiles, no fingerprinting — only privacy-friendly aggregate visit counts. See our Privacy & Legal page.
- Works offline. Internet is a feature (optional sharing, accounts), never a requirement for core gameplay.
- Made by a human. One developer, making things with care, giving them away freely.
About Onion Madder
Onion Madder is the independent developer behind the Madderverse and the founder of Mad Sundar LLC. She builds the games because she got tired of watching kids' apps turn into ad-delivery machines, and because she believes powerful creative tools should reach the kids who would otherwise be priced out of them. Read the longer story on the About page.