This app was mentioned in 2 comments, with an average of 2.00 upvotes
https://play.google.com/store/apps/details?id=com.square_enix.android_googleplay.dqportal_gp
You download the portal app and then 1/2/3 can be purchased individually inside it.
<strong>@DQ_PR</strong>: >2015-12-09 02:23:41 UTC
>スマホ版『ドラゴンクエストⅡ』50%OFF 12/20(日)まで! 『DQポータル』からご購入いただけます App Store⇒ <em>itunes.apple.com</em> Google Play⇒ <em>play.google.com</em> #DQ2
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