Refinery is a multi-leveled map completely over an oil-drilling platform in the Arctic. It remains one of the most competitive medium to long range combat despite its smaller size. The long sightlines over platforms is a shooting gallery for snipers and light machine gunners. Many of the areas have a view on the other side, but no means to cross without traversing the upper or lower levels first.
In the map's center, the rig's control interior provides a lot of cover points and sniping positions as well, however close quarters seems to be the dominant style in this area. Staying mobile in the tight corners goes a long way, although moving out to the main platform areas can cause CQC specialists to fall prey to snipers.
There are more red oil barrels on this map than any other in the game. When they are flaming, they have a tendency to explode under gunfire or whenever a player walks nearby. These make excellent traps, especially when rigged with C4 or Claymores.
Several larger oil tanks around parts of the map can be destroyed. The flames will cut off areas and obscure vision. Walking through can result in a suicide, although it can be survived if the player moves through quickly or has Blast Shield.