X-COM: UFO Defense

Level Skip:
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At the BattleScape screen, press [Ctrl] + C to 
complete the current level and advance to the 
next one. 

Playing Tip: 
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Before finishing a mission, be sure to unload all 
weapon clips (including those found on aliens). 
If you don't, any loaded clips will be lost and 
you'll have to buy more.