What is considered the world's top selling single toy of all time?

Turambarka, Barbie dolls are, generally, only purchased by/for female children, and predominantly in Western countries. But Rubik's Cubes were bought by/for male & female children and adults all over the world. So, even though many Western girls have several barbie dolls, the cube had a much larger market.

Interesting...I've owned dozens of frisbees but only one Rubik's Cube

No one owns multiple cubes but many families have multiple frisbees

There is no way more rubik cubes have been sold than frisbees.

Know More! • With six coloured sides, 21 pieces and 54 outer surfaces, there are over 43 quintillion (that's 43,252,003,274,489,856,000 to be precise) different possible configurations. • Every single position of a Rubik's Cube can be solved in twenty moves or less.

Turambarka, I love her. they even have one like Angela Merkel 😂

cube is the best thing, I love it

I dont know one person who has a rubiks cube

player384555, the sentence can be interpreted as: Six faces each covered by nine stickers Or Six faces covered by nine stickers each. However it is not mandatory within English grammar to include the word each.