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Half-Life: Opposing Force Hints
What do I need to destroy with the mortar launcher?
1 of 5: You probably want to get past the large, wood-plank wall on the opposite side of the field. Therefore, take aim at that.
2 of 5: You can chip away at pieces of the wall, but you usually end up taking out the entire thing in one shot.
3 of 5: Once the wall falls, a few aliens will run out from behind the garage door. Deal with them and then find the regular-sized door directly next to the garage door and run in.
4 of 5: Note that if you don't want to deal with the aliens when you destroy the wall, you can avoid that by turning the mortar all the way to the left and only taking a chunk out of the very left part of the wall, then going down there and jumping through it.
5 of 5: You can destroy other things as well, such as a tower standing near the ruins of an old building.