4D Toys is an innovative educational application designed for iPhone users, offering a unique experience to understand the concept of four-dimensional space. It features over 130 interactive scenes that allow users to play with stunning 4D shapes through an advanced physics engine that incorporates time as an additional dimension. Users can engage in activities such as fitting hypercubes into hyperholes, using 4D shapes as dice, and even manipulating objects in a virtual 4D ball pit.

The app is equipped with multi-touch and accelerometer support, enhancing the interactivity of the experience. Additionally, it includes a 10-page interactive book that explains the fourth dimension through engaging analogies. Users can also explore special features like anti-gravity and wireframe projections, as well as the ability to export 3D meshes for printing. 4D Toys effectively combines learning and play, making complex mathematical concepts accessible and enjoyable.