Colour by code series is educational colouring activity books. These books are created in a planned way where each page will have MOSAICS form of pictures having core illustration(s). Each drawing will consist of MULTIPLE PIECES with the educational concept such as numbers / letters, words, etc. inserted in various pieces and where each concept corresponds to a specific colour key. The goal of these books are to help children learn Mathematical and Language concepts using higher order thinking skills like sorting or classifying.