When "Desktop Site" option is turned on, you can pinch and zoom so you see all buttons and you can pass validation. Visibility of flips in short session is great. Take a look at video showing how short session looks. Buttons are smaller, but I don't think it's to much problem to click on them.
https://www.youtube.com/watch?v=qXj1nzmHzPc
Don't we need a validation demonstration that is exactly the same as the original one? I don't mean the validation mechanism, but the entire validation UI when practicing validation for beginners, starting from the button size and also the timer.
The next validation I will try to invite some friends who use smartphones. I hope luck is on my side.
I last year had wanted to mine idena. It's an interesting project for me. Where "Idena is the first proof-of-person blockchain based on democratic principles. Every node is linked to a cryptoidentity – one single person with equal voting power and mining income."
That's not the IDNA price, $ 48 is the price a few months after today. You can check the current price here: Coinmarketcap