“…c) Achievement reward: Users are rewarded with a cue for unlocking the achievement. Usually, these achievements are visible to players (AlSkaif et al, 2018;Barbosa et al, 2017;Bartle, 1996;Casals et al, 2017;Chou, 2015;Dorji et al, 2015;ecoGator, 2016;Fijnheer and Van Oostendorp, 2016;Game | 2020Energy, 2018Geelen et al, 2012;Hamari and Eranti, n.d.;Matallaoui et al, 2015;Ouariachi et al, 2019;Stieglitz et al, 2016). Game-related: Players earn points toward the maximum achievement points possible as a manner to dispose and accumulate high-value rewards (Bartle, 1996).…”