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. This is quite expensive because the price doubles when your resource box is empty. Now select the most expensive improvement and buy it. The price per resource for improvements is cheapest of the three.
Next units is cheapest, and the price per resource for wonders is the most expensive.
Now select the desired wonder, and buy the remaining resources. That's a nice amount given the price of wonders. Wait until your screen saver shows up. Get military on a forbidden square cheat 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. After gaining gunpowder and combustion your old barracks get obsolete and you have to build new ones.