Defusing a mine is worth 1 charge or 9 charges respectively. You cannot see behind you. Scanning takes 1 ammo charge, so do not waste all your charges scanning. You get 2 more damage capacity points whenever you kill someone. Maximum typeahead is 5 characters.
Diagonal walls deflect shots and change orientation.
Doors disperse shots in random directions. Diagonal walls and doors cannot be destroyed by direct shots. Walls regenerate, reappearing in the order they were destroyed.