You read the title! After starting a debate about this topic in the Site Disccusions and Suggestions forum, I'm moving it here. Which version of UNO is the most fun, complex, original, anything! Is it the original UNO? What about UNO Attack (or Extreme)? Do you like to turn up the speed with UNO Flash? Tell me below! In my opinion, UNO Attack/Extreme is the best version because it adds most suspense and tension due to the added layer of luck it has. It's also more complex with the added cards, which makes it even more fun.