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.


Grid Learning Limited
96.9 MB
Requires iOS 7.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2014 GridClub Limited
In-App Purchases
  1. full version with all 4 levels, 24 scenes and 480 questions $0.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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