This is an interactive missal and prayer book where you can find everything related to Mass –following the Roman Rite- in five different languages, including Latin. In addition to the liturgy to follow Mass, with explanations of some of the symbols and the priest’s secret prayers that come up in pop-up screens, this application offers you everyday readings of Mass, as well as some knowledge and comments about the Gospel and the Saint of each day. This application will help you unveil and understand the mystery that takes place during Mass right in front your eyes. You well learn to see what cannot be seen: you will learn to see in 3 Dimensions. You will also find some prayers and explanations previous to Mass, and other ones to meditate and pray at the end, after Communion. It contains a great number of ways to give thanks after Mass, both original and classical. The so called other sacraments section includes the liturgy and prayers having to do with Other Sacraments and functions, such as: Confession, Communion of the sick and Communion outside Mass, and many prayers referred to the deceased. Keywords Mass, Eucharist, Responsory, prayer book, prayers, to give thanks, Communion