This app was mentioned in 2 comments, with an average of 1.00 upvote
Are you sure about that? I haven't seen any direct limitations on the Free games. You are talking about this app, right?
It's for Net MJ, a riichi mahjong client made by Sega. It's on the Japanese iTunes and Google Play stores, but it's not region-locked, so you can get an APK or make a .jp iTunes account to download it.
https://itunes.apple.com/jp/app/net-ma-que-mjmobairu/id666206963?mt=8
https://play.google.com/store/apps/details?id=jp.co.sega.am2.MJMobile&hl=en