YOU SAID:

My little brother is playing flappy bird blocks

INTO JAPANESE

私の弟はゆるい鳥のブロックを遊んでいます

BACK INTO ENGLISH

My brother is playing a flappy bird block

INTO JAPANESE

私の兄はゆるい鳥のブロックを遊んでいる

BACK INTO ENGLISH

My brother is playing a flappy bird block