Two kids had an idea for the game they wanted to play. Their monsters and bosses went in, an AI wrote the code, and now it’s a whole world you can walk around in. The only way to win a battle is to read.
You make a character that looks like you, pick a first monster, and head out into the tall grass. Something jumps out, a word comes up, and reading it is your attack.
How You Play
- Make your character and choose your first monster: a pup, a bud or a bat.
- Walk through the tall grass until a wild monster jumps out, or get spotted by a trainer on the path.
- Read to attack. Some rounds show a word and you tap the picture that matches it. In others a voice says a sentence and you find the word you heard. Get it wrong and the monster hits you back.
- When a monster gets tired, find its name to throw a catch ball. Every monster you catch goes in your card collection.
- Beat the boss of each land and the big rock on the path rolls away, opening up the next land.
What Kids Practice
- Decoding real words. More than 200 of them, introduced in phonics order, starting with short words like “pup” and “mop” and getting harder as you go.
- Reading for meaning. On the silent rounds nothing is spoken, so the only way to the right picture is to read the word.
- Listening for a word in a sentence, which is a big help for kids just getting started.
- Extra practice on hard words. Words a player misses come back more often until they stick.
- Simple adding. At the monster hospital, kids heal their monster by solving sums.
Made by Jack and Rafa
This game comes from the two kids in its name. Jack and Rafa invented 12 of the monsters, including the bosses Dada, Dogogo, Barbo and Char Thief. The rest follow their style, and each is named with a word kids can read by that point in the game.
It’s vibe-coded, which means it was built by describing it in plain words to an AI, in this case Claude, and trying it out until it was right. A voice reads out the signs, the characters and the directions, so a kid who’s just starting can still get around.
- Ages
- 3–7
- Teaches
- 📖 reading · 🔢 math
- Kind of play
- 🔁 practice & drills · 📚 story · 🏖️ explore & sandbox
- Works on
- 📱 phone · 📲 tablet · 🖥️ computer
- Good to know
- 🔊 uses sound · 💾 saves progress
- Made with
- Claude
- Hosted
- Right here on Open Recess
Questions About Jack & Rafa's Monster World
What Age Is Monster World For?
It’s made for kids about 3 to 9. The words start with short, easy ones and get harder in later lands, and a voice talks kids through the game, so those still learning their letters can play with a grown-up nearby.
Is Monster World Free?
Yes. There’s nothing to buy, no sign-up and no pop-up ads. The dollars in the game are Jack and Rafa dollars, and you earn them by winning battles.
What Does “Vibe-Coded” Mean?
It means a game was made by telling an AI what you want in plain words, trying what it builds and asking for changes, without writing the code by hand. Jack and Rafa’s ideas were turned into this game with Claude.
Does It Teach Phonics?
Yes. The words follow the same phonics order as Munch, our learn-to-read game, one group of sounds at a time. Each new land brings in the next sounds.
Does It Work on a Phone or Tablet?
Yes. It runs in the browser on phones, tablets and computers, with nothing to install. Turn the sound on, because the voice is a big part of the game.
Does It Save Progress?
Yes. Progress saves in the browser on the device you’re playing on, with no account needed. Clearing your browser’s data or switching devices starts a new game.
