算数忍者３Dずけいの巻 is a free education app developed by Fantamstick Ltd. for the Android platform. It is a game-based app that helps to improve logical thinking, spatial awareness, and imagination by solving math problems related to counting, addition, guessing, and comparing sizes. The app features 3D graphics that allow users to rotate geometric shapes using their fingertips and experience a realistic sense of depth and movement.

The app is designed to be intuitive and easy to use for children and adults alike. It has a wide range of colorful characters and collectible cards that motivate children to complete each stage and collect all the cards. The app offers four different types of training that stimulate knowledge, and a final stage that integrates all four types of training. The app also features a story that provides a clear mission and setting to encourage children to progress and learn while having fun.