It involved pretty much the same actors - most of Europe plus North America and Russia, just allied slightly differently: France playing Germany's role and the USA on the wrong side! What made the 1914-18 war the first official World War instead?
I was recently asked this question by one of my former teachers that I now work with. I asked her, "Did Japan get involved in it?" That it itself should be the answer because in reality the Napoleonic Wars are a European series of wars.
No, the Seven Years War was. Fought in Europe, North America, India, and the Caribbean.