Yay, DB Classic, now I can help you.
When you create a box for a wall, use the make static collision box command to create an invisible collision box in the exact position as the wall. Do you have experience with sliding collision? If you don't, I can give you an example. If you do, then you should be able to figure it out. There are sliding collision examples that come with DB, take a look at those to figure it out.
Good Luck
Xander Moser of Bolt Software
Firewall: Your Computer's First Defense - Real Time Strategy game
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