Wii Sports without question. It was synonymous with the Wii. It was why the console went viral.

Second to that, but first among dedicated gamers, is Halo. Halo made Xbox a thing. It was a massive success in that regard. I don't believe the history of Xbox would be nearly as good without Microsoft acquiring Halo. Halo was all over the place during that time and everyone was talking about. It was a really big deal.

I don't think any of the other games on that list had nearly as much impact.

Historically, I don't see how it can be any game other than Super Mario Bros. That game releasing with the NES established Nintendo and Mario as household names. The original Super Mario Bros. over-world theme is arguably the most iconic tune in gaming history and one of the most iconic sounds in pop culture. Anybody, anywhere, who hears it, knows right away what it is. But even more importantly, it revived the video game industry and brought it back from the brink it was in after the crash of '83, and the industry hasn't looked back since. Greatness in terms of the game itself and how great it is or plays is purely subjective, same with every other game on this list, But in terms of its importance to the video game industry, the console it launched on, the company that developed it, and its impact on pop culture... It's no contest. Let me put it this way, there would be no Breath of the Wild, if there was no Super Mario Bros.

There's Super Mario Bros., and then there's everything else.

SMB isn't really a launch game (released with Duck Hunt 2 years after the launch of the Famicom.

I would say Super Mario 64, one of the greatest games of all time

Halo 1 actually doesn't have online multiplayer. Halo 2 was the game that claimed the innovation in console matchmaking. Though the Halo 1 PC Port did have online multiplayer. Think that released months later though. 

Super Mario 64.

Breath of the Wild is a good contender, but Super Mario 64 still takes it for me. The game was basically perfect, groundbreaking, and became a standard for all other 3D games to follow because of it. Besides that though it was also a lot of fun to play. It had tons of variety, intelligent level design with loads of secrets to discover. It has one of the most memorable soundtracks in the history of gaming, and I can still play pretty much all of it in my head at any time. Control was flawless, and in new games the question often comes to me how a lot of things are still worse than what Super Mario 64 did. Also, no non-Nintendo launch game ever came close to the big Nintendo launch titles. They are the undisputed king of launch titles, with some even remaining a console’s best game all the way until the end. What other console manufacturer ever launched with a Mario 64, Breath of the Wild or Wii Sports? Hell even a Luigi’s Mansion.

I am not a Zelda fan so I go with Mario, the question is which one?
The original smb was iconic, the problem is that smb3 completely demolished it, making the original Mario almost obsolete, on the other hand for me smw was a bit of a let down compared to what I consider the undisputed champion of 2d platformers smb3.
So I go with Mario 64, the game opened a need world, Mario controlled like a super athlete, I had fun just jumping around , the music is iconic,it created the collectaton,the levels remain unforgettable, Mario 64 is a timeless master piece, still the best 3D Mario.

With the first 2 I agree but wii sports? I never understood why the world went crazy with that one trick pony, and luigi’s Mansion was pretty average, nice atmosphere but very repetitive gameplay.

Knack

Tetris, an it isn't even in the poll...

Just two days ago I was explaning to my younger son about GB and Tetris. Honestly, no matter how much some other titles helped their consoles to become successful, I can't think of better example than Tetris and GB.