Panzer General 2

Unlimited prestige points:
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Clear a city of enemy units and place one of 
your units within that city. 
Cancel the moving your units into the city 
to keep the prestige points earned. 
Repeat this procedure to gain an unlimited 
amount of prestige points. Note: 
This will only occur if the difficulty is 
over 100%. 

Gametip:
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When the menu comes up, select play by e-mail mode. 
Save the game and load it. You can then play as both 
sides.