This paper describes Cipher – Faoi Gheasa, a 'game with a purpose' designed to support the learning of Irish in a fun and enjoyable way. The aim of the game is to promote language 'noticing' and to combine the benefits of reading with the enjoyment of computer game playing, in a pedagogically beneficial way. In this paper we discuss pedagogical challenges for Irish, the development of measures for the selection and ranking of reading materials, as well as initial results of game evaluation. Overall user feedback is positive and further testing and development is envisaged.