This research is focused on the random type item providing system called "Gacha" in the social game of the smartphone application. Gacha includes gambling elements and has caused many problems like too much charge, not available rare items and so on. In order to follow the related laws and protect users, game providers have announced the provision rate of items by Gacha in accordance with the guidelines. It is researched whether the announcement of probability influence to the users' behavior and what intention users have for Gacha. Questionnaires about attitude to social games and Gacha were provided 3 times to students. Questionnaires results were analyzed dividing into charging and non-charging users. This research also aim to construct user model about intention to social games with Gacha. This paper summarize the three-year trend from 2016 when this survey started.
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