What event has the most amount of nationalities represented in its top 100?

[Puzzle Maniac]

Over the coming week, I will be updating this thread with the amount of countries seen in an event's top 100 rankings. I will try to do a couple each today, working my way down the WCA events list until we find out which of the 17 events is most diverse. But who knows? I may have overestimated the amount of time it takes to tally an event, and we might finish in a day. Feel free to help if you wish. My proposed method that I will put into play once I finish writing it is to see which average places 100th on persons rankings, then switch over to region rankings and count how many flags are above and equal to that time.
Until then, place your bets on which event you think it will be crowned the winner. Something tells me it won't be 3x3 in a sea of Chinese and American flags...

 

[Puzzle Maniac]

3x3: 25 unique countries
China, Poland, USA, Philippines, Russia, Canada, South Korea, Romania, Australia, Brazil, Netherlands, UK, New Zealand, Norway, Germany, Italy, Taiwan, Hungary, Vietnam, France, Chile, Israel, Indonesia, Argentina, and Switzerland
2x2: 28 unique countries
USA, China, Singapore, Poland, Netherlands, UK, Sweden, Australia, Spain, Israel, Russia, Canada, Norway, South Korea, Colombia, Denmark, Romania, India, Hungary, Georgia, Germany, New Zealand, Hong Kong, Mexico, Slovakia, Chile, and Italy
4x4: 34 unique countries
Poland, USA, Russia, Germany, Vietnam, China, South Korea, Philippines, Netherlands, Taiwan, Australia, Ireland, Hong Kong, Denmark, New Zealand, Singapore, India, Malaysia, Mexico, Norway, Canada, Indonesia, South Africa, Chile, Thailand, Switzerland, Argentina, Israel, Brazil, Portugal, Italy, Finland, Romania, and Sweden
5x5: 35 unique countries
Poland, Russia, USA, Vietnam, South Korea, Taiwan, China, Malaysia, Singapore, Australia, Ireland, Hong Kong, Germany, Canada, Philippines, Switzerland, South Africa, New Zealand, Romania, Argentina, UK, Thailand, Norway, Indonesia, India, Netherlands, Finland, Sweden, Chile, Czechia, Brazil, Mexico, Denmark, Japan, and France

Some more coming in a few hours, hopefully.​