The 'best' game is just a matter of opinion, it depends on which genre of games you like, and how difficult it is to play. Assuming you are talking about Video Games, The best-sellers should be an indication of which games are most popular:
The above list have supposedly sold over 100 million copies throughout the franchise, with Mario selling the most at 262 million. However, this doesn't neccessarily mean the 'best' game is in the list.
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Howzat is the best cricket game in the world
he best game in 2018 will be world cup 2018
Angry video game nerd
Call of Duty Is the best game in the world. because in World at war of can beat the game in get Nazi Zombies.
tales of the world: radiant mythology