World's Key is an interactive educational application designed for Kindergarten and Primary Levels. Developed by Mohammad Bzeih, this iPhone app is available for free and falls under the Education & Reference category.

The application is specifically designed for students who are enrolled in schools that use the World's Key curriculum. It complements the printed books used in the classroom by providing audio-visual lessons and interactive exercises in English and Science. Students can access the application through their online accounts, which are provided by the school.

World's Key offers a wide range of features to enhance the learning experience. The audio-visual lessons help students grasp concepts more effectively, while the interactive exercises allow them to practice and apply what they have learned. The application also includes assessments to evaluate the students' understanding of the lessons.

It's worth noting that World's Key does not offer any paid services or content. Each student at the participating schools is given a unique passcode to access the app's content, including lesson videos and additional exercises.

Overall, World's Key is a valuable tool for students in Kindergarten and Primary Levels, providing them with an engaging and interactive learning experience in English and Science.