Editing SS13 for experienced programmers (section)

=== Turf ===

  var/intact = 1 //This determines if the turf will hide pipes, cable and such. Set to 1 to hide and to 0 to not hide them. Only pipes and wire with level set to 1 will be hidden. Set their level var to 2 to keep them from being hidden.
  var/blocks_air = 0 //Determines if the turf prevents air from passing (walls) if set to 1.
Other variables exist but they're tied to atmospherics code which is not to be touched as whenever anything is changed in it it results in a million things breaking.
  [https://github.com/tgstation/-tg-station/blob/master/code/game/turfs/turf.dm code/game/turfs/turf.dm]

==== Simulated ====

Simulated floors are tiles which simulate air movement and temperature. The station is made entirely from these while centcom is made from unsimulated floors to prevent massive and unneeded lag.

  var/wet = 0 //If this it a positive number, it is wet and you'll slip on it if you run.
  var/thermite = 0 //Will be set to 1 when thermite is poured on it.

===== Simulated floors =====

  var/icon_regular_floor = "floor" //Determines what icon the steel version of the floor should have. Determined at floor creation (New() proc). If the icon_state of the floor at that point is one from the global icons_to_ignore_at_floor_init var, then this variable is assigned the value "floor". The icons_to_ignore_at_floor_init list contains broken, plating, burnt and non-steel icon_states from icons/turf/floors.dmi
  heat_capacity = 10000 //When a fire (hotspot) on the tile exceeds this number, the floor has a chance of melting. The more the number is exceeded, the higher the chance of melting.
  var/broken = 0 //This mostly only determins if you'll get the tile back when you use the crowbar
  var/burnt = 0 //This mostly only determins if you'll get the tile back when you use the crowbar
  var/obj/item/stack/tile/floor_tile = new/obj/item/stack/tile/steel //What floor tile is on the tile

Simulated floors are defined in:
  [https://github.com/tgstation/-tg-station/blob/master/code/game/turfs/simulated/floor.dm code/game/turfs/simulated/floor.dm]

===== Simulated walls =====

Doesn't really contain any special new variables.

Defined in:
  [https://github.com/tgstation/-tg-station/blob/master/code/game/turfs/simulated/walls.dm code/game/turfs/simulated/walls.dm]