Everyone has one and I assume, GBATEMP, a forum full of gamers from all over the world might have interesting answers.
As for myself, TETRIS is the answer.
I grew up playing that game and I've played it a lot throughout my entire life. Recently, been playing a lot of Arcade versions and been having a great time, and my favourite version is TETRIS DS, although TETRIS for GB has a lot of nostalgia, and TETRIS by TENGEN is in my top 5 favorite versions of TETRIS.
As for myself, TETRIS is the answer.
I grew up playing that game and I've played it a lot throughout my entire life. Recently, been playing a lot of Arcade versions and been having a great time, and my favourite version is TETRIS DS, although TETRIS for GB has a lot of nostalgia, and TETRIS by TENGEN is in my top 5 favorite versions of TETRIS.