diff --git a/lib/classes/board.js b/lib/classes/board.js
index 72a649b..f994ac9 100644
--- a/lib/classes/board.js
+++ b/lib/classes/board.js
@@ -84,14 +84,22 @@ GridGame.classes.board = function () {
 
   };
 
-  this.place_random_rock = function() {
+  // TODO maybe move these two to an obstacle placing object
+  this.place_n_obstacles = function(flag_name, number) {
+    for(var i = number; i > 0; i--){
+      this.place_random_obstacle(flag_name);
+    }
+  };
+  
+  this.place_random_obstacle = function(flag_name) {
     var x = Math.floor(Math.random() * GridGame.width);
     var y = Math.floor(Math.random() * GridGame.height);
     var tile = this.tile(x, y);
-    if (tile.city || tile.rock) {
-      this.place_random_rock();
+    if (tile.city || tile.rock || tile.wall) {
+      this.place_random_obstacle(flag_name);
     } else {
-      tile.rock = true;
+      tile[flag_name] = true;
+      tile.value = GridGame[flag_name + '_health'];
     }
   };
 
diff --git a/lib/classes/player.js b/lib/classes/player.js
index 59939dc..293f491 100644
--- a/lib/classes/player.js
+++ b/lib/classes/player.js
@@ -2,7 +2,7 @@ GridGame.classes.player = function (config) {
 
   GridGame.player_components.control_panel.apply(this);
   GridGame.player_components.direction_change.apply(this);
-  
+
   this.config = config;
   this.name = config.name;
   this.playable = config.playable;
@@ -42,12 +42,14 @@ GridGame.classes.player = function (config) {
     var target_is_city = target.city;
     var target_already_stepped_to = target.changed_player;
     var target_is_rock = target.rock;
+    var target_is_wall = target.wall; // TODO and wall has health
     return (
       target_present &&
       (target_unowned || target_belongs_to_me) &&
       !target_is_city &&
-      !target_already_stepped_to && 
-      !target_is_rock
+      !target_already_stepped_to &&
+      !target_is_rock &&
+      !target_is_wall
     )
   };
 
diff --git a/lib/classes/tile.js b/lib/classes/tile.js
index fcdad3c..1382893 100644
--- a/lib/classes/tile.js
+++ b/lib/classes/tile.js
@@ -10,6 +10,7 @@ GridGame.classes.tile = function (x, y) {
   this.value = 0;
   this.city = false;
   this.rock = false;
+  this.wall = false;
 
   // used in turn process
   this.value_change = 0;
@@ -88,7 +89,8 @@ GridGame.classes.tile = function (x, y) {
         return (css.match(/\btile_\S+/g) || []).join(' ');
       })
       .toggleClass('tile_city', this.city)
-      .toggleClass('tile_rock', this.rock);
+      .toggleClass('tile_rock', this.rock)
+      .toggleClass('tile_wall', this.wall);
 
 
     if (this.player && this.value > 0) {
@@ -97,10 +99,12 @@ GridGame.classes.tile = function (x, y) {
   };
 
   this.display_character = function () {
-    if (!this.player || this.value <= 0) {
+    if ((!this.player && !this.wall) || this.value <= 0) {
       return ''
     } else if (this.city) {
       return 'C<small>' + this.value + '</small>';
+    }  else if (this.wall) {
+      return '<small>' + this.value + '</small>';
     } else {
       return this.value;
     }
diff --git a/lib/data/game.js b/lib/data/game.js
index ee4ae02..0a66138 100644
--- a/lib/data/game.js
+++ b/lib/data/game.js
@@ -4,5 +4,7 @@ GridGame.data.game = {
   turn_time: 100,
   spawn_interval: 3,
   city_conversion_size: 10,
-  rock_count: 0,
+  rock_count: 10,
+  wall_count: 100,
+  wall_health: 100
 };
diff --git a/lib/grid_game.js b/lib/grid_game.js
index b070dc1..f37efa4 100644
--- a/lib/grid_game.js
+++ b/lib/grid_game.js
@@ -14,7 +14,10 @@ var GridGame = {
     this.turn_time = GridGame.data.game.turn_time;
     this.spawn_interval = GridGame.data.game.spawn_interval;
     this.city_conversion_size = GridGame.data.game.city_conversion_size;
+
     this.rock_count = GridGame.data.game.rock_count;
+    this.wall_count = GridGame.data.game.wall_count;
+    this.wall_health = GridGame.data.game.wall_health;
 
     this.game_space = $('#grid_game');
     this.turn_number = 0;
@@ -66,9 +69,8 @@ var GridGame = {
   },
 
   init_obstacles: function() {
-    for(var i = this.rock_count; i > 0; i--){
-      this.board.place_random_rock();
-    }
+    this.board.place_n_obstacles('rock', this.rock_count);
+    this.board.place_n_obstacles('wall', this.wall_count);
   },
    
   // Operation
diff --git a/lib/turn_phases/do_damage_phase.js b/lib/turn_phases/do_damage_phase.js
index dde89e2..ce7d290 100644
--- a/lib/turn_phases/do_damage_phase.js
+++ b/lib/turn_phases/do_damage_phase.js
@@ -10,6 +10,7 @@ GridGame.turn_phases.do_damage_phase = function() {
     this.player = null;
     this.value = 0;
     this.city = false;
+    this.wall = false;
   };
   
 };
diff --git a/lib/turn_phases/do_movement_phase.js b/lib/turn_phases/do_movement_phase.js
index 6e28aca..33eea50 100644
--- a/lib/turn_phases/do_movement_phase.js
+++ b/lib/turn_phases/do_movement_phase.js
@@ -7,7 +7,7 @@ GridGame.turn_phases.do_movement_phase = function () {
   };
 
   this.do_city_conversion = function() {
-    if (!this.city && this.value >= GridGame.city_conversion_size) {
+    if (!this.city && this.value >= GridGame.city_conversion_size && this.player != null) {
       this.value = 10;
       this.city = true; 
     }
diff --git a/lib/turn_phases/mark_damage_phase.js b/lib/turn_phases/mark_damage_phase.js
index 9d894e1..b1ff795 100644
--- a/lib/turn_phases/mark_damage_phase.js
+++ b/lib/turn_phases/mark_damage_phase.js
@@ -1,7 +1,7 @@
 GridGame.turn_phases.mark_damage_phase = function() {
 
   this.mark_damage_phase = function() {
-    if (this.player) {
+    if (this.player || this.wall) {
       var tile = this;
       $.each(
         this.neighbours(),
@@ -15,12 +15,12 @@ GridGame.turn_phases.mark_damage_phase = function() {
   this.mark_damage_from_neighbour = function (neighbour) {
     if (!neighbour) {return false}
     if (!neighbour.player) {return false}
-    var neighbour_belongs_to_enemy = (neighbour.player != this.player);
-
+    var neighbour_belongs_to_enemy = (this.player == null || neighbour.player != this.player);
     var neighbour_is_alive = neighbour.value > 0;
+
     if (neighbour_belongs_to_enemy && neighbour_is_alive) {
       this.value_change -= neighbour.value;
     }
-  }
+  };
 
 };
diff --git a/style/grid_game.css b/style/grid_game.css
index b99a252..ca3da17 100644
--- a/style/grid_game.css
+++ b/style/grid_game.css
@@ -113,13 +113,17 @@ table.game_board tr.row td.tile_yellow {
   color: orangered;
 }
 
-table.game_board tr.row td.tile_city small {
+table.game_board tr.row td.tile small {
   font-size:10px;
 }
 
 table.game_board tr.row td.tile_rock {
   background-color: #777777;
-  color: #444444;
+}
+
+table.game_board tr.row td.tile_wall {
+  background-color: #ff190E;
+  color: #dddddd;
 }
 
 .footer {