Cheat mode
While playing a game, hold [Shift] and type 1234567890 to enable cheat mode. This will allow you to view enemy cities, sell their improvements, unfortify their units, rearrange their resources, and view the power chart and the replay.
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You can choose your own colours for your tribes if you use debug. Get into the directory and type for example --debug civil0.sve When you get the prompt from the debug routine, type d for display. The computer will then print out the first 80h bytes of the file. I believe it is the third byte which is the human player. Use e for edit and by changing the numbers you can get any colour available 00=red (but then you act like the barbarians and there are a couple of other twists) 01=white, 02=green, 03=blue 04=yellow, 05=light blue, 06=pink and 07=grey.

Settler cheat:
You can make settlers build roads, irrigation, etc. in one turn (instead of the normal 2 - 12). Make the settler unit build a road or irrigation. When, in the same turn, another unit highlights, go back to settler, and click on it. Now the R or I disappear. Make the unit build a road or irrigation again. Repeat this a few times until the desired advancement is build.

Extend movements:

• Move ships long distances in one turn in pairs by passing a cargo unit back and forth.
• Move land units long distances by having them go on sentry duty in a city and reactivating them the same turn.
• Have ships 'steal' loads. A ship will load as many units as it can when it leaves a square, including at sea when another ship just ended its turn at the same spot.

Make unit move twice each turn:
Move your units as usual. Save the file. Quit Civ and reopen this file. Now you can move your units again, while the year hasn't been changed. However the amount of money, etc. hasn't been changed yet. This can be handy if barbarians arrived and you can't reach them with your army in one turn.

Cheap wonders and units If you want to buy a wonder/unit/improvement (a rush job) the price per resource is different. If you want to buy a wonder immediately for the cheapest prize, do this:

• Select the cheapest unit or improvement.
• Buy it. This is quite expensive because the price doubles when you're resource box is empty.
• Now select the most expensive improvement.
• The price per resource for improvements is cheapest. Then come the units, and the price per resource for wonders is the expensive.
• Buy it.
• Now select the desired wonder, and buy the remaining resources. This process can save up to 50% of the costs. That's a nice amount given the price of wonders.

Get military on a forbidden square:
Use a diplomat or caravan to enter a square a military unit could otherwise not reach and then occupying it in the same turn with the military unit