Before update which made challenges harder (when there were 2 opponents on higher levels) I finished majority of challenge maps, but some remained undefeated. Now I finally started winning again.

But 'United States' map took me 20997 days of game time (~30 hrs of real time on my PC Stick)...

Please don't punish me like that anymore... :D

30 hours !! yikes

Kind of ridiculous tbh considering that you're just watching stuff happen.

GL on Europe Huge. haha

try a device with more fps.
most browsers cap at some point...

I had to zoom in at the empty part of map to not see anything during most of the 'game'. Otherwise it would take even 4-6 times longer.

And I have beaten 'Europe Huge' already in the beginning of the year, before patch, so my biggest worry now is Triskelion.

The challenge levels are way too hard now.

The amount of AP i would need to invest to even beat challenge 6/31 is already soo much im not even considering it anymore.

My biggest problem among the first few challenge levels was number 9, which I finished right before Europe Huge. Now I have to find out, how to beat 13 and 14.

Timi is right ... device matters. When I play in browser, Floating Rocks takes 1.5 minutes to finish, but on my mobile it finishes in 10 secs! Huge difference. Browser plods along slowly, but the territory capture movement in the mobile app explodes across the map quickly.