Number Reef: Swim & Learn
Add, Subtract, Multiply & More
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Swim, solve, and score! Catch the correct bubbles, dodge the wrong answers, build a 5-answer streak for double points, and unlock new fish.
Learn math while exploring a colourful underwater world.
You are the fish. Swim through the ocean, solve each question, and catch the bubble with the correct answer. Avoid incorrect bubbles, protect your lives, build winning streaks, and collect points to unlock new characters.
LEARN WHILE YOU PLAY
Choose what you want to practise:
• addition
• subtraction
• multiplication
• division
• percentages
• mixed questions
Select the type of questions that suits you and improve your maths skills through play.
CATCH THE CORRECT BUBBLE
Each question appears with several answer bubbles. Swim towards the correct answer and avoid the wrong ones.
Choose carefully. A wrong bubble costs you a life, so stay focused and react quickly.
BUILD A STREAK
Answer five questions correctly in a row to activate a streak and earn double points.
Keep choosing the right answers to maintain your momentum, improve your score, and unlock rewards faster.
WATCH FOR HELPER FISH
Special helper fish sometimes swim across the screen carrying useful bonuses, including:
• point multipliers
• extra lives
• other helpful power-ups
They swim fast, so stay alert and catch them before they disappear.
UNLOCK NEW CHARACTERS
Collect points while you play and use them to unlock new fish characters.
Keep practising, improve your high score, and expand your underwater collection.
PRACTISE AT YOUR OWN LEVEL
Choose the calculations you want to practise and play at a level that matches your ability.
Start with simple sums or challenge yourself with multiplication, division, percentages, and mixed questions.
FOR DIFFERENT AGES AND ABILITIES
• Ages 5–8: practise addition and subtraction
• Ages 9–11: improve times tables and multiplication
• Ages 12+: work on division, percentages, and mixed questions
From first calculations to more challenging exercises, the game makes maths practice active, visual, and fun.
SWIM, SOLVE, AND IMPROVE
Catch the right bubbles, dodge the wrong answers, collect bonuses, unlock new fish, and become faster and more confident at maths with every game.
Added additional promotional videos showcasing different levels and characters, improved overall performance, and refined the design for iPad and right-to-left languages.
The developer, Jens Somers, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Jens Somers
- Size
- 16.9 MB
- Category
- Games
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
English and 76 more
- English, Afrikaans, Albanian, Amharic, Arabic, Armenian, Assamese, Azerbaijani, Basque, Belarusian, Bengali, Bosnian, Bulgarian, Burmese, Cambodian, Catalan, Croatian, Czech, Danish, Dutch, Estonian, Faeroese, Finnish, French, Galician, Georgian, German, Greek, Gujarati, Hebrew, Hindi, Hungarian, Icelandic, Indonesian, Irish, Italian, Japanese, Kannada, Kazakh, Korean, Laotian, Latvian, Lithuanian, Macedonian, Malay, Malayalam, Marathi, Mongolian, Nepali, Norwegian Bokmål, Oriya, Persian, Polish, Portuguese, Punjabi, Romanian, Russian, Serbian, Simplified Chinese, Singhalese, Slovak, Slovenian, Spanish, Swahili, Swedish, Tamil, Telugu, Thai, Tibetan, Turkish, Uighur, Ukrainian, Urdu, Uzbek, Vietnamese, Welsh, Zulu
- Age Rating
4+
- 4+
- Made for Ages 6–8
- In-App Purchases
Yes
- Eenmalige Premium-upgrade $3.99
- Copyright
- © 2026 Hakketjak