This study applied the information processing view and the concept of fit to improve understanding of how attachment behaviour and continued use in mobile social network game (M-SNG) players is affected by the alignment between their motivation and technological capability. A quantitative method and a cross-sectional study design were used to evaluate the research model. Data were collected for 427 active M-SNG players in Taiwan. The proposed model was tested with fit as a covariation and with fit as a propensity score in matching method. The results of this study verified that (1) coalignment between motivation and technological capability is positively associated with attachment behaviour in M-SNG players; (2) M-SNG players who have a high coalignment between motivation and technological capability have stronger attachment behaviour compared to players with low coalignment; and (3) attachment behaviour is positively associated with continued use of M-SNGs. This study contributes to the literature by improving understanding of the antecedents of attachment and continued use in M-SNG players. For providers and developers, this study also provides insights into how to improve the business performance of M-SNGs.INDEX TERMS Information processing view, fit, player motivation, technological capability, attachment, mobile social network game.