Spelling · Maths · Friendship

Otter and Mosey and
the Lost Islands

A rainbow crystal has shattered, and six extraordinary islands need a little help. Join Otter and Mosey on a spelling, maths and friendship adventure.

Six islands. One extraordinary friendship.

Find the pieces of the Great Rainbow Crystal, help the island guardians and bring colour back to the world. Collect stars, meet pets and decorate your very own home island along the way.

A little learning in every adventure

Pop spelling bubbles, splash through number challenges and build rainbow bridges. Six game modes weave UK Year 3 spelling, typing and maths into 30 levels. Hints and learning settings help children find their own pace.

Ready, little explorer?

Play with a keyboard and mouse or touch controls. On a phone or tablet, turn your screen sideways. Adjust sound, calmer motion and other options in the game’s Settings.

Progress is saved in this browser on this device, with separate local player profiles. It does not sync between browsers, devices or the app. Clearing website data or using private browsing can remove progress.