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Originally posted by J_Smoken_T:
you dont even need 6 mines and deffently not 10 to 12 i use 5 .Two on the side of doors or hallways at head level those will kill .the 5th goes on the floor in the middle so when they hit it or try to go around it they hit the mines at head level and boom

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If you actually read his post he said the tunnels, not buildings.