I have always wondered what is the game most people in the world

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I have always wondered what is the game most people in the world completed? It's impossible to find any real stats, but it must be something with very high sales, also not too long, boring or hard, let's take a look at 10 best selling games ever:
1)Tetris
Impossible to beat
2)Minecraft
I think most of players just play it like sandbox
3)Wii sports
Impossible to beat
4)GTA 4
Too long and people mostly play online
5)Super Mario Bros.
Too hard
6)Mario Kart Wii
Impossible to beat
7)Wii Sports Resort
Impossible to beat
8)Pokémon Red, Green and Blue
Didn't play this one, so got no idea
9)New Super Mario Bros.
Didn't play it either
10)Skyrim
Storyline is short and easy, but there is so much other stuff that it's possible many didn't bother with main quest, still I think out of this 10 this is most likely candidate