Bigroom 3 may have some walls replaced with other terrain

dat/bigrm-3.lua

@@ -30,6 +30,14 @@ des.map([[
 -- Dungeon Description
 des.region(selection.area(01,01,73,16), "lit");
 
+-- replace some walls
+if percent(66) then
+   local sel = selection.match("[.w.]");
+   local terrains = { "F", "T", "W", "Z" };
+   local choice = terrains[math.random(1, #terrains)];
+   des.terrain(sel, choice);
+end
+
 -- Stairs
 des.stair("up");
 des.stair("down");