Well a bunch are physical copies but they made the distinction of “mobile” versions as well (Gameboy physical version yes lol)

I read somewhere that Tetris has sold 520 million copies world wide.

EDIT: I read the article and they make the distinction of Teris having sold 520 million copies but it’s a total of variations. Do they not consider Minecraft also has variants as well (Xbox One, Xbox 360, Bedrock, Java, Pocket Edition which are the “same” game but different)? All I know for sure is I bought like 7 or more copies of Minecraft so they better thank me lol.