The realization of this project has been based on expanding an already existing project that focuses its goal on using gamification in teaching environments. So it has been developed on the technologies that were already implemented in that previous project. This document describes how the "Collections" module was made to be used in a school gamification environment through the use of a mobile application. We will be able to see the design of each of the models that are part of this module and the functionalities that it offers and allows to realize to the different users. The document does not focus on explaining in detail how we have implemented the code but rather details and explains from the user's point of view each of the functionalities that it has and how it interacts with the application and with the other users. I have dedicated a part of the document to perform a set of tests that every new user or developer should do before starting to work on the application, to be able to perform each of its functions and also recognize when the application is running correctly. The project uses open source technologies and all the existing work done and the added one in this project, is in public repositories so it is open to future developments by new developers. The software components that have been used are part of the latest technologies currently in the developer community as JavaScript in its ECMAScript 6 standard or HTML5 technology. The work methodology followed has allowed to complete most of the objectives established at the beginning of the project and the final result is currently functional and can be tested for correctness of errors in real cases of use.