“…Social Interaction was also commonly employed as a means to engage users and was found to increase user experiences of fun and motivation in the context of moderating alcohol consumption ( Boendermaker et al, 2015 ), to have a positive influence on physical activity (Juho Hamari and Koivisto, 2015 , Maher et al, 2015 , Spillers and Asimakopoulos, 2014 ) and flourishing mental health ( Hall et al, 2013 ). Less commonly employed gamed design elements across studies included levels ( Cafazzo et al, 2012 ; Juho Hamari and Koivisto, 2015 , Kuramoto et al, 2013 , Ludden et al, 2014 ), progress ( Ahtinen et al, 2013 , Ludden et al, 2014 , Spillers and Asimakopoulos, 2014 ), story/theme ( Boendermaker et al, 2015 , Jones et al, 2014b , Jones et al, 2014a ), challenges ( Ludden et al, 2014 , Spillers and Asimakopoulos, 2014 ) and feedback ( Kadomura et al, 2014 ).…”