There's multiple games I remember being "my first game". I played tons of educational computer games as a child but none of them particularly stick out to me, nor do I remember at what age I was when I actually played them. Same goes for Snood - I know I played it, but not at what age.
The two games that stick out to me is Mario Kart Wii and Bowser's Inside Story. I was about seven or eight at the time of playing those. Mario Kart Wii was a fun game to play with friends, but Bowser's Inside Story is what really got me into playing video games.
I also played Bowser's Inside Story when I was little on emulator, although it was after I played my first ever games. That game is absolutely brilliant to this day and the numbers show it, but I still like Superstar Saga slightly more because of how broken it is (I even did a TAS for SS).
Open season for the gameboy, i never even beat the first level
Why didn't anybody write about his/her first mobile game? My first mobile game was one of the coolest and most addictive games I have ever played. It was Framed 2. Great comic-styled puzzle game, it kept me playing for days on. This is one of the most addicting games I have ever tested on my mobile device.
I was probably too young to remember but I think it was Mario Party DS