
Maths Lagoon
Sail with Tumi from Coral Cove to The Deep. Catch the fish with the right answer to open each gate and bring the lagoon's magic back.
- Adding, taking away, times tables, dividing, fractions
- 5 places, 3 missions each
For children aged 5 to 12. Your child helps Tumi catch number fish, read the signs on Word Island and solve shell puzzles on the beach, learning as they play.
No download, no sign-up. Plays in the browser on phones, tablets and computers.

Three adventures
Tumi lives at the bay. From there your child chooses where to go today. Questions match their age, get quietly easier when your child is stuck, and Tumi offers a step up when they're flying.

Sail with Tumi from Coral Cove to The Deep. Catch the fish with the right answer to open each gate and bring the lagoon's magic back.

A big wind blew the words off all the signs. Your child reads, matches and fills in missing words to put them back.

A quiet beach corner with no clock. Count shells, find pairs that make 10, 20 or 100, and collect real South African shells.
See it in action
Every screen shows what to do, how many are left and what comes next, so children always know where they are.




How it works
Children see an adventure. Grown-ups see the learning underneath it.
Your child helps Tumi on short missions of 5 questions. Each right answer fills Tumi's jar, and three missions open a gate to the next place.
Short runs, easy to stopA wrong answer gets a kind hint about the method, never just the answer. After two tries, Tumi works it out step by step with pictures.
Making ten, number lines, groupsSea friends, baby creatures, stickers, outfits for Tumi and real shells. Every mission adds something to keep.
Rewards that bring them backFor parents and teachers
Shell Haven was designed with autistic children in mind: clear steps, predictable rewards, and settings you control.
Turn down movement, sounds and surprises, one part at a time, for children who prefer less stimulation.
Tumi reads every question out loud, so children who are still learning to read can play on their own.
See what your child gets right first time, their strongest skill, what needs practice and what to try next.
Choose 10, 15, 20 or 30 minutes a day. Tumi gently suggests a break when time is up.
No adverts and no sign-up. Your child's name and progress stay on your device. We only count visits anonymously to improve the game.
Any phone, tablet or computer with a web browser. Nothing to install and nothing to update.
Pricing
Try the first places of every adventure for free, for as long as you like.
No sign-up needed
Unlocks the whole of Shell Haven on your device
TUMI-2611-ABC-1234.Questions
No. Shell Haven runs in the web browser on any phone, tablet or computer. Open the link and tap Play. You can add it to your home screen from the browser menu so it opens like an app.
Children aged 5 to 12. When your child starts, Tumi asks their age and picks questions for 5–7, 8–10 or 11–12. You can change this any time under "Grown-ups: report and settings".
Each code opens everything until the end of its month. When you pay for the next month, we send you a new code. If you stop, the game goes back to the free places, and your child's progress is kept.
Not yet. Progress and the unlock code are saved on the device and browser where your child plays. Use the same device each time, and avoid private or incognito browsing, which clears the save.
There are no adverts, no chat and no sign-up. Your child's name and progress stay on your device. We count visits anonymously to see which parts children enjoy, and never send names or what they type.
English. Some parts of Maths Lagoon are also in isiZulu and Sesotho, and more is on the way.
The first places are free. No download and no sign-up, just tap and play.
Start playing free