Opening the iTunes Store.If iTunes doesn't open, click the iTunes application icon in your Dock or on your Windows desktop.Progress Indicator
Opening the iBooks Store.If iBooks doesn't open, click the iBooks app in your Dock.Progress Indicator

iTunes is the world's easiest way to organize and add to your digital media collection.

We are unable to find iTunes on your computer. To download the free app Radius of the lost Arc by GridClub Limited, get iTunes now.

Already have iTunes? Click I Have iTunes to open it now.

I Have iTunes Free Download

Radius of the lost Arc

By GridClub Limited

This app is only available on the App Store for iOS devices.


PARENT UK: "If you have children between 7-11 years they will love this App - a fantastic adventure game to teach a whole range of topics - great graphics and animations - we can see it is helping Joe with his levels and understanding - well done" - Sally Goldsmith, Parent, London, UK.

PARENT USA: "I'm very impressed, this app is just brilliant for kids, Thomas will spend at least 20 minutes playing and asking questions - he loves this game! , he's even gone up a group this term" - Janet Wilkinson - Facebook Review

SCHOOL, USA: "An excellent App to reinforce and extend children's understanding in maths, brilliant for 1st to 5th grade revision" - Janet Stevens, Teacher, Sunnyvale Primary School, Florida, USA.

SCHOOL, UK: "We've always used Radius for revision and reinforcement at school, especially for SATs in the spring - proven results and we can see the increased levels of achievement in class" - Peter Henshaw, Maths Coordinator, Four Oaks Primary, England, UK

Radius of the lost Arc is a fun and challenging learning adventure for children from 7-11 years. This game is used in many thousands of homes and schools around the World to improve children’s mathematical skills

*** WINNER *** "Radius won a British BAFTA award for 'best online learning'
*** WINNER *** "97% teachers said 'Radius made a real difference in class' - Independent School Review, Scotland, UK

Kids can expect to be snapped up by crocs and swamped by red-hot lava if they get the questions wrong!

For the kids to read - Welcome to the island of Sequans. You have been sent here to rescue the Lost Arc from the Temple of Doom . You must show no fear and have great mathematical skills to complete this task. If you do not you will die. You will need all the help you can get.

Good luck! - look out for the special reward if you are clever enough to rescue the Lost Arc!

The game covers many areas of the mathematics school curriculum for Key Stage 2, 1st to 5th Grade (7-11 yrs) including:

Number Work & Fractions;
Addition and Subtraction;
Measurement and Time;
Money and Shape;
Weight and Measurement;
Sequencing and Ordering;

There are 4 levels of difficulty, 24 scenes and 480 randomly selected questions so kids will be constantly challenged to extend and improve their mathematical skills.


iPhone Screenshot 1
iPhone Screenshot 2
iPhone Screenshot 3
iPhone Screenshot 4
iPhone Screenshot 5
iPad Screenshot 1
iPad Screenshot 2
iPad Screenshot 3
iPad Screenshot 4
iPad Screenshot 5
Radius of the lost Arc
View in iTunes
This app is designed for both iPhone and iPad
  • Free
  • Category: Games
  • Released:
  • Version: 1.0
  • Size: 96.9 MB
  • Language: English
  • Seller:
Rated 4+
  • Made for Ages 9–11

Compatibility: Requires iOS 7.0 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

This application hasn’t received enough ratings to display a summary.

Top In-App Purchases

  1. full version with all 4 levels, 24 scenes and 480 questions$0.99