here's mine. I am currently playing 3rd level (monarch?). I'm still finding my way in this game, so the ai has a tech lead on me and has better production cities. I missed out on every singe wonder except colossus until I finally got to the industrial age. I nabbed universal suffrage and the mighty hoover dam.
Ancient:
Colossus- 3: I rate it this high because it is attainable. the ai never really goes for it fast. but the effects aren't all that great.
Great Library-3: expires too early imho. and nearly impossible to get
great lighthouse-2: a little bit easier to get, but I still can't get it. good to keep out of the ai's hands. keeps the ai expansion down for a while
great wall-0: worthless. build offensive units instead. defense is worthless in this game. all offense is what you need
Hanging Gardens-2: I need this one, but still too hard to get since I went for republic
Oracle-1: useful if you don't get hanging gardens. I didn't get either one and I'm surviving.
Pyramids-4: too much growth can be difficult to manage, but the pyramids makes things so much easier. get it if you can, but I never can.
Medieval
Adam smiths-4: I had money problems in my last game. I would have liked to get this. but if you don't build those improvements in most of your cities don't bother
Copenicus- 3: too figgin' hard to get. good for a super science city though
Bach's Cathedral-3: good if you don't get sistine chapel. but I couldn't even get this one
Lenardos- 4: like I said I had money problems. this makes upgrading affordable, and the ai will respect your upgraded military more
Magellons-3: something I always got in civ2. no more. too hard to get, but very nifty to have
Sistine chapel-4: hugely important. I couldn't get it though
Newtons-3: same as copernicus. nice to have for science city
Shakespear-0: worthless. get it only if you are going for culture win
Sun Tzus-4: good for peacniks or warmongers. nice to have barracks on newly captured cities. Or have them on fringe cities with high corruption
Industrial:
Hoover Dam-5: highly important. Because you will likely be equal or behind in tech. You need production to win the game for you
United Nations 0 (5): only useful for diplomatic victory- duh!
Theory of Evolution-2: too hard to get
Universal Suffrage 3- much easier to get. and it helps with war in democracy
Modern:
Cure for cancer:3- should get this if you miss sistine chapel or bach's cathedral
Lengetivity- 2: get this if you never got pyramids
SETI- 2: not as useful this late in game. but can give much needed kick to science city if you have one
Manhatten project-1: unless you like nuclear war...
Ancient:
Colossus- 3: I rate it this high because it is attainable. the ai never really goes for it fast. but the effects aren't all that great.
Great Library-3: expires too early imho. and nearly impossible to get
great lighthouse-2: a little bit easier to get, but I still can't get it. good to keep out of the ai's hands. keeps the ai expansion down for a while
great wall-0: worthless. build offensive units instead. defense is worthless in this game. all offense is what you need
Hanging Gardens-2: I need this one, but still too hard to get since I went for republic
Oracle-1: useful if you don't get hanging gardens. I didn't get either one and I'm surviving.
Pyramids-4: too much growth can be difficult to manage, but the pyramids makes things so much easier. get it if you can, but I never can.
Medieval
Adam smiths-4: I had money problems in my last game. I would have liked to get this. but if you don't build those improvements in most of your cities don't bother
Copenicus- 3: too figgin' hard to get. good for a super science city though
Bach's Cathedral-3: good if you don't get sistine chapel. but I couldn't even get this one
Lenardos- 4: like I said I had money problems. this makes upgrading affordable, and the ai will respect your upgraded military more
Magellons-3: something I always got in civ2. no more. too hard to get, but very nifty to have
Sistine chapel-4: hugely important. I couldn't get it though

Newtons-3: same as copernicus. nice to have for science city
Shakespear-0: worthless. get it only if you are going for culture win
Sun Tzus-4: good for peacniks or warmongers. nice to have barracks on newly captured cities. Or have them on fringe cities with high corruption
Industrial:
Hoover Dam-5: highly important. Because you will likely be equal or behind in tech. You need production to win the game for you
United Nations 0 (5): only useful for diplomatic victory- duh!
Theory of Evolution-2: too hard to get
Universal Suffrage 3- much easier to get. and it helps with war in democracy
Modern:
Cure for cancer:3- should get this if you miss sistine chapel or bach's cathedral
Lengetivity- 2: get this if you never got pyramids
SETI- 2: not as useful this late in game. but can give much needed kick to science city if you have one
Manhatten project-1: unless you like nuclear war...
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