Played to 500BC...Save is attached.
I will have to add more of a write-up later tonight.
Don't forget to switch to representation, and organized religion too.
You still can't work the gems. I'd have settled 1 N of the gems. I think you should settle 1 SE of the gems soon.
Producing a settler for this city is far more important than building chizen itza.
(almost anything is more important than building chizen itza)
The only advantage of chizen Itza is the 25% defense bonus, and you won't need that with the great wall and no AI's on your continent.
You should have started farming Berlin earlier. Your cities can grow very large with representation and your happy resources. I think Berlin needs a library and not a temple, because you can then run additional specialists next to your wonders to
try to get a few scientists .
You must try to improve the good tiles first, The riverside tiles in Berlin are better than the ordinary grassland, and the floodplains around Munich are better than plains or grasslands. You have enough workers, but they've been improving too much cottage tiles you won't use for a long time.
Do you want to run specialists in Munich? I think cottaging is bett with a couple of floodplain farms for initial growth. It's faster to let all workers work on the same far
The wheat in Berlin and the corn in Nidaros can be irrigated after you get civil service,
so it will give one more food. This means you need a chain of farms starting next to a river or lake, wich each will irrigate the next farm.
The easiest way to do that is farming the tile SW of berlin (the chain can also go through a city, if it's not on a hill), and the tile 2 E of Nidaros.
I would use Nidaros for a second production city and mine the hills, and not bother with non-riverside cottages there. Cottaging it up and moving the captol to Nidaros later is also possible. It's nicely in the middle of the island.
You'll want to mine the riverside hills soon anyway.
You really don't need a courthouse yet. The usual rule of thumb for a courthouse, is when your upkeep is 8, and you are nowhere near that anywhere. Munich could really use a library with its gold and floodplain cottages.