On the multi player level "warlords" if you get the rocket launcher you can make a tunnel from one base to another. All you have to do is get a rocket launcher and shoot the ground in front of you base until there is a small hole then get in it and shoot the wall of the hole torwards the other base. You will die a couple of times from the explosions but it's really fun to do.(It also helps if you have a friend over to help).Also you can just dig a big hole or make trenches with the same process.
Have Fun!!!!!!!!!!
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