This New Years Eve will see the removal of both the Game Boy Virtual Console version of Tetris and the retail (and eShop) versions of Bandai Namco’s Tetris from sale in Japan. There’s no news regarding Puyo Puyo Tetris thus I expect it still to be allowed to be sold. I’ll update this post if I hear words opposite to that effect. Sources: http://www.nintendo.co.jp/3ds/software/atlj/index.html and http://www.nintendo.co.jp/3ds/eshop/vc/rbsj/index.html