Christian Moss — MandelDuck
Mayu Moss — MandelDuck

MANDELDUCK STUDIOS

A two-duck army making games & videos 🦆🦆

We're a tiny indie studio making games that are quick to pick up and hard to put down — from local multiplayer racers and arcade cabinets to quirky little games you can play right in your browser — plus parodies, mockumentaries and explainers on video. No fuss, no fine print. Just fun.

▶ Play BTC Rally 📺 Watch ❤️ Patreon </> GitHub @ Twitter / X 💼 Hire Us

📺 MandelDuck TV

Parodies, mockumentaries and explainers. New videos all the time.

New · Parody

🦍 Planet Bitcoin

A nature documentary about one of the most fascinating, least understood species on Earth: the Bitcoiner.

A parody. Not affiliated with, or endorsed by, David Attenborough or the BBC.

Planet Bitcoin 2 is coming soon.

📺 Planet Bitcoin & more Watch on YouTube ↗
Bitcoin Seinfeld
Series · 21 episodes

Bitcoin Seinfeld

A show about nothing. Except bitcoin. Quick-hit sketches and longer cuts, all in one binge-able guide.

▶ Watch the series
AI Seinfeld
AI Parody · 5 episodes

AI Seinfeld

Full-length episodes Seinfeld never wrote, made by machines.

▶ Watch AI Seinfeld
Bitcoin Explained
Explainers

Bitcoin Explained

Long-form, step-by-step explainers: Lightning, Ark, BitVM, drivechains, silent payments and more.

▶ Watch the playlist
The Inside Truth: a mockumentary, coming soon
Coming Soon

The Inside Truth

A mockumentary from the creators of Spinal Taproot and Bitcoin Seinfeld. Plus Planet Bitcoin 2.

See what's coming

See every video on YouTube ↗ ❤️ Support us on Patreon

// whoarewe

MandelDuck is Christian & Mayu Moss — a two-duck indie studio making honest bitcoin games (and the occasional arcade cabinet).

Christian Moss

Christian Moss

Games & Bitcoin

Indie game dev and bitcoin nerd. Jamming real bitcoin into games since 2014, back when everyone said it couldn't be done. Co-founder of ZBD and a firm believer that the best way to learn bitcoin is to earn it while having fun.

Mayu Moss

Mayu Moss

Design & Japanese

Designer and Japanese translator. Shapes how MandelDuck looks and feels, and bridges our games and words between English and Japanese — bringing bitcoin gaming to Japan. 🇯🇵

🏆 Achievements Unlocked

  1. 2014

    SaruTobi

    The first mobile game in the world to pay out real bitcoin to players. Swing the monkey, earn sats. Covered by CoinDesk — and back on the App Store today.

  2. 2016

    Takara

    Real-world AR bitcoin treasure hunt — geocaching with sats before Pokémon Go. One of the first iOS games with actual bitcoin, and an early pioneer of in-game assets on Counterparty.

  3. 2019

    Co-founded ZBD

    Bitcoin & Lightning payments built for games. Helping developers pay and reward players in real bitcoin, at scale.

  4. 2019

    Full Node on Your TV

    Ran a fully validating Bitcoin & Lightning full node on a stock Android phone — and your TV — for free, no special hardware. Read the write-up →

  5. 2020+

    MintGox

    Bitcoin gaming events & esports — showcasing games built on bitcoin and the Lightning Network. Watch on YouTube →

  6. NOW

    Games for the real world

    Building plug-and-play bitcoin games for conferences, bitcoin hubs and venues — download, connect ZBD or LNbits, and let the sats fly.

Vincent's Cats — nine Van Gogh paintings hung in gilt frames: The Starry Night, Café Terrace at Night, Starry Night Over the Rhône, The Bedroom, Wheatfield with Crows, The Night Café, Sunflowers, Irises and The Sower
Now 9 Paintings

🎨 Vincent's Cats

Walk into Van Gogh's paintings and go cat-spotting. Start under the swirling sky of The Starry Night, then step onto the Café Terrace, the banks of the Rhône, into The Bedroom and The Night Café, out to the Wheatfield with Crows, the Irises and The Sower’s field — or shrink to cat size among the Sunflowers.

The cats hide somewhere new every time you play. A full 3D first-person world that runs right in your browser — every brushstroke painted live — with real meows and each painting’s own sounds. Mouse & keyboard or touch. More paintings coming soon.

▶ Step into the paintings
Totoro Kakurenbo — an old Japanese farmhouse on a summer afternoon, with Totoro, Satsuki and Mei in the front yard
New

🌳 トトロのかくれんぼ · Totoro Hide-and-Seek

Mei is hiding somewhere in the summer countryside. Play Satsuki, with Totoro padding along beside you, and search the house, the rice paddies, the shrine and the giant camphor tree to find her.

Everything is spoken in Japanese — 「もういいかい？」「まーだだよ！」, villagers greeting you in the lanes, Mei giggling from her hiding place — made for our son to hear Japanese spoken. Runs in your browser and on iPad (Add to Home Screen). A non-commercial fan tribute; not affiliated with Studio Ghibli.

▶ あそぶ · Play
1066 — The Unfinished Tapestry: King Harold running across an embroidered Bayeux-style landscape as arrows fly in
Just Released

🏹 1066: The Unfinished Tapestry

An embroidered escape from the Battle of Hastings. Play as Harold Godwinson — jump, duck and shield your way through 60 seconds of Norman arrows and stitch a different ending.

Runs right in your browser, no download. Hand-animated straight out of the Bayeux Tapestry, keyboard and touch controls included. History is written by the victors — this time it's stitched by you.

▶ Play in your browser
Bitcoin Seinfeld — a scene from The Mempool Nazi
On the Air

📺 Bitcoin Seinfeld

A show about nothing. Except bitcoin. 21 episodes and counting — quick-hit sketches and longer cuts, all in one binge-able guide.

Search the episodes, filter by length, or hit shuffle if you can't decide. Yada, yada, yada.

▶ Watch the episodes
AI Seinfeld — an AI-generated episode set in a recording studio
AI Generated

🤖 AI Seinfeld

A show about nothing, made by machines. 5 brand-new episodes that Seinfeld never wrote — and never would.

Full-length, AI-generated parody. Hit play, then try not to laugh. We dare you.

▶ Watch AI Seinfeld
Satoshi Arcade — a custom bitcoin arcade cabinet running MandelDuck games
New Build

🕹️ Satoshi Arcade

A real, four-player bitcoin arcade cabinet I built from scratch — loaded with my games: BTC Rally, GoldenPie, Brawl and more.

Powered by ZBD — drop in, grab a controller, and play to earn real sats. Built to drop into conferences, bitcoin hubs, bars and meetups so anyone can experience bitcoin gaming hands-on.

🎮 Press Start

BTC Rally stage select screen
Win / macOS

BTC Rally

Local multiplayer kart-style racer. Everyone pays a few sats to enter, winners take the pot. Faucet mode too. Powered by ZBD or LNbits — perfect for events & bitcoin bars.

Download on itch.io
GoldenPie: License to Pill logo
Open Source

GoldenPie

An Electron launcher that drops bitcoin rewards into retro N64 classics (hi, GoldenEye 007). Get a kill, watch the sats rain. Anyone can download and set it up.

View on GitHub
SaruTobi logo and pixel monkey
iOS

SaruTobi

The OG. The monkey-swinging arcade game that started it all in 2014 — the first to tip players in real bitcoin. Back on the App Store with ZBD Lightning rewards.

Follow for updates
Takara bitcoin geocaching screens
AR · Retired

Takara

Hunt and plant real bitcoin treasure in the real world. A geocaching treasure hunt with sats and Counterparty tokens — a true bitcoin gaming original.

Read the story

📺 Highlights

A decade of jamming real bitcoin into games — newest first.

GoldenEye N64 bitcoin lightning integration▶ Nov 2025GoldenEye N64 — Bitcoin Lightning Play the classic N64 GoldenEye and earn real bitcoin, streamed to your Lightning wallet. BTC Rally trailer▶ Jul 2025BTC Rally — Official Trailer The kart-style bitcoin racer. Stake sats, race your friends, winner takes the pot. Super Mario 3 NES bitcoin integration▶ Jan 2023Super Mario 3 (NES) — Bitcoin Hooked up a real NES — every coin grabbed streams sats over Lightning via ZBD. Beat Saber lightning demo▶ Jun 2021Beat Saber — Lightning Demo A mod that pays out sats as you play. Play-to-earn, conference-ready. Lightning gaming trilogy Bitcoin 2019 hackathon▶ Jun 2019Lightning Gaming Trilogy Three games built for the Bitcoin 2019 Lightning hackathon, starting with Blockchain Fighters. ABCore plus LND full node running on Android▶ Apr 2019Full Node on Android (ABCore + LND) A fully validating Bitcoin + Lightning full node running on a stock Android phone — for free. Takara bitcoin geocaching demo▶ Jan 2016Takara — Bitcoin Geocaching A tech demo of the real-world bitcoin treasure-hunt game. SaruTobi teaser▶ Nov 2014SaruTobi The original teaser for the first mobile game to pay players real bitcoin.

💼 Work With Us

Independent studio for hire — available to studios, startups and events worldwide.

We take on consulting engagements drawing on 15+ years shipping games, building real bitcoin payment systems, and design & Japanese localization. Engaged as an independent studio on a business-to-business basis.

  • 🎮
    Video GamesDesign, prototyping, mobile & desktop, Unity, live-ops.
  • 🛡️
    Anti-CheatDetection, integrity, fair-play systems and exploit hardening.
  • ₿
    Bitcoin & LightningPayments, rewards, ZBD / LNbits integration, play-to-earn.
  • 🤖
    AILLM integration, agents, tooling and automation for games and products.
  • 🇯🇵
    Japanese TranslationGame & app localization and translation between English and Japanese.
$50 USD / hour

Remote or on-site. Get in touch with what you're building and we'll reply with availability.