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Is soccer all that different and unique compared to sports it has been influenced by? And e.g. American Football vs Rugby? Some of the fighting sports are somewhat similar to each other too.

Actually I meant for the broader relation , soccer to American Football, Boxing to golf. Rugby -v- Football is a iteration, not the creation of a game. Rugby -v- golf is! Video games should try breaking out like this. Otherwise it iphone4 to iPhone6 -- Wow iteration! Even Intel understand there needs to be
both tick and tock.
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(and perhaps they weren't even the first crazy ).

I can't be sure about who was first, however if at the same time, the Mayans has a version of gladiator death pit ,soccer/basketball - soccer with a wall mounted hoop goal.... So we can see great difference way beyond the 20%'ish ideas.