I am also trying Challenger. It does feel harder than Deity---Mutineer is right about that. If Gyathaar tested the game and the AIs were only slightly ahead of the normal tech pace at 500 BC, something must have been changed between his test and the actual game.
However, this is no reason for Mutineer to be a complete jerk. The game is way harder than a normal Monarch game, and that's
good, because I think Monarch is super boring.
At 5 AD, I'm one turn away from Colossus (it turns out you can get some wonders at this setting because the AIs tech so fast that they consider those wonders too old to be worth building, I guess). I'm also 2 turns from Machinery; unfortunately, everyone except Roosevelt already has it. My ability to get anything useful by tech trading has been minimal.
I am beginning to doubt that the game is winnable, but I will probably keep playing for a while. Unfortunately, Huayna Capac is Annoyed with me (Augustus Caesar demanded I switch to Confucianism, and I agreed, probably unwisely), and if he attacks me, that's probably game over---I can't really see how I can defend myself with just warriors. If I had stayed neutral, then cultural win might have been possible.
I did found a city on the hut, next to the iron. I'm surprised everyone didn't do that.
I had one annoying instance of bad luck---my trireme lost to a barb galley, which pillaged my fish. Not nearly as bad as my luck in GOTM15, though.
4000 BC: founded Nidaros in place
3790 BC: Buddhism in a distant land
3760 BC: Hinduism in a distant land
3460 BC: Animal Husbandry
3160 BC: Mining
2860 BC: Judaism in a distant land
2650 BC: Bronze Working
2350 BC: The Wheel
2020 BC: Pottery
1960 BC: Uppsala founded 7E 1N (silk)
1690 BC: Confucianism in a distant land
1570 BC: Haithabu founded 4E 1N (gems)
1480 BC: Sailing
925 BC: Iron Working
865 BC: Birka founded 8E 2S (pigs, 2 horses)
820 BC: Writing
760 BC: My trireme loses to barb galley, near Nidaros
760 BC: Christianity in a distant land
580 BC: Alphabet
550 BC: I'm so far behind, someone gives me Mathematics!
520 BC: Christianity spreads to Haithabu
490 BC: Taoism in a distant land
475 BC: Bjørgvin founded 5E 2S (2 iron, clams)
325 BC: Metal Casting
310 BC: trade for Masonry, Mysticism
265 BC: Jelling founded 12E 1S (gems, clams)
160 BC: Compass
145 BC: trade for Polytheism
130 BC: trade for Priesthood
130 BC: Confucianism spreads to Birka
85 BC: Buddhism spreads to Bjørgvin
5 AD: Roskilde founded 11E 3N (fish, silk)