diff --git a/i-mic-rts.rb b/i-mic-rts.rb
index af25eb3..9a62256 100755
--- a/i-mic-rts.rb
+++ b/i-mic-rts.rb
@@ -11,6 +11,8 @@ require "nokogiri"
 require "json"
 require "socket"
 
+require_relative "lib/exts/string"
+
 require_relative "lib/version"
 require_relative "lib/errors"
 require_relative "lib/window"
@@ -40,9 +42,10 @@ require_relative "lib/order"
 require_relative "lib/friendly_hash"
 require_relative "lib/director"
 require_relative "lib/player"
-require_relative "lib/entity_controller"
+require_relative "lib/tool"
 require_relative "lib/connection"
 
+
 require_relative "lib/networking/protocol"
 require_relative "lib/networking/packet"
 require_relative "lib/networking/server"
diff --git a/lib/component.rb b/lib/component.rb
index d2f68ee..cec2908 100644
--- a/lib/component.rb
+++ b/lib/component.rb
@@ -7,7 +7,7 @@ class IMICRTS
     end
 
     def self.inherited(klass)
-      name = klass.to_s.split("::").last.gsub(/([^A-Z])([A-Z]+)/,'\1_\2').downcase.to_sym
+      name = klass.to_s.to_snakecase
 
       if get(name)
         raise "#{klass.inspect} is already defined!"
diff --git a/lib/components/sidebar_actions.rb b/lib/components/sidebar_actions.rb
index de71bae..1d7d468 100644
--- a/lib/components/sidebar_actions.rb
+++ b/lib/components/sidebar_actions.rb
@@ -9,28 +9,28 @@ class IMICRTS
       @actions = []
     end
 
-    def add(type, *args)
+    def add(type, data = {})
       action = Action.new
 
       case type
       when :add_to_build_queue
-        ent = IMICRTS::Entity.get(args.first)
-        raise "Failed to find entity: #{args.first.inspect}" unless ent
+        ent = IMICRTS::Entity.get(data[:entity])
+        raise "Failed to find entity: #{data[:entity].inspect}" unless ent
 
         action.label = ent.name.to_s.split("_").map{ |s| s.capitalize }.join(" ")
         action.description = "Cost: #{ent.cost}\n#{ent.description}"
-        action.block = proc { @parent.component(:build_queue).add(args.first) }
+        action.block = proc { @parent.component(:build_queue).add(data[:entity]) }
 
-      when :set_build_tool
-        ent = IMICRTS::Entity.get(args[1])
-        raise "Failed to find entity: #{args[1].inspect}" unless ent
+      when :set_tool
+        ent = IMICRTS::Entity.get(data[:entity])
+        raise "Failed to find entity: #{data[:entity].inspect}" unless ent
 
         action.label = ent.name.to_s.split("_").map { |s| s.capitalize }.join(" ")
         action.description = "Cost: #{ent.cost}\n#{ent.description}"
-        action.block = proc { @parent.director.game.set_tool(:building, ent) }
+        action.block = proc { @parent.director.game.set_tool(data[:tool], data) }
 
       else
-        raise "Unhandled sidebar action: #{action.inspect}"
+        raise "Unhandled sidebar action: #{type.inspect}"
       end
 
       @actions << action
diff --git a/lib/director.rb b/lib/director.rb
index 8a4bdcc..e8d7aa7 100644
--- a/lib/director.rb
+++ b/lib/director.rb
@@ -1,7 +1,7 @@
 class IMICRTS
   class Director
     attr_reader :current_tick, :map, :game
-    def initialize(game:, map:, players:, networking_mode:, tick_rate: 10)
+    def initialize(game:, map:, players: [], networking_mode:, tick_rate: 10)
       @game = game
       @map = map
       @players = players
@@ -14,6 +14,10 @@ class IMICRTS
       @current_tick = 0
     end
 
+    def add_player(player)
+      @players << player
+    end
+
     def update
       if (Gosu.milliseconds - @last_tick_at) >= @tick_time
         @last_tick_at = Gosu.milliseconds
diff --git a/lib/entities/buildings/construction_yard.rb b/lib/entities/buildings/construction_yard.rb
index 357b008..67db116 100644
--- a/lib/entities/buildings/construction_yard.rb
+++ b/lib/entities/buildings/construction_yard.rb
@@ -1,7 +1,7 @@
 IMICRTS::Entity.define_entity(:construction_yard, :building, 2_000, "Provides radar and builds construction workers") do |entity|
   entity.has(:build_queue)
   entity.has(:sidebar_actions)
-  entity.component(:sidebar_actions).add(:add_to_build_queue, :construction_worker)
+  entity.component(:sidebar_actions).add(:add_to_build_queue, {entity: :construction_worker})
 
   entity.radius = 40
   entity.max_health = 100.0
diff --git a/lib/entities/buildings/helipad.rb b/lib/entities/buildings/helipad.rb
index 521fded..ab1100a 100644
--- a/lib/entities/buildings/helipad.rb
+++ b/lib/entities/buildings/helipad.rb
@@ -1,7 +1,7 @@
 IMICRTS::Entity.define_entity(:helipad, :building, 1_000, "Builds and rearms helicopters") do |entity|
   entity.has(:build_queue)
   entity.has(:sidebar_actions)
-  entity.component(:sidebar_actions).add(:add_to_build_queue, :helicopter)
+  entity.component(:sidebar_actions).add(:add_to_build_queue, {entity: :helicopter})
 
   entity.radius = 26
   entity.max_health = 100.0
diff --git a/lib/entities/buildings/war_factory.rb b/lib/entities/buildings/war_factory.rb
index fe861f5..53fdb73 100644
--- a/lib/entities/buildings/war_factory.rb
+++ b/lib/entities/buildings/war_factory.rb
@@ -1,9 +1,9 @@
 IMICRTS::Entity.define_entity(:war_factory, :building, 2_000, "Builds units") do |entity|
   entity.has(:build_queue)
   entity.has(:sidebar_actions)
-  entity.component(:sidebar_actions).add(:add_to_build_queue, :jeep)
-  entity.component(:sidebar_actions).add(:add_to_build_queue, :tank)
-  entity.component(:sidebar_actions).add(:add_to_build_queue, :harvester)
+  entity.component(:sidebar_actions).add(:add_to_build_queue, {entity: :jeep})
+  entity.component(:sidebar_actions).add(:add_to_build_queue, {entity: :tank})
+  entity.component(:sidebar_actions).add(:add_to_build_queue, {entity: :harvester})
 
   entity.radius = 48
   entity.max_health = 100.0
diff --git a/lib/entities/units/construction_worker.rb b/lib/entities/units/construction_worker.rb
index c2e506a..aa98702 100644
--- a/lib/entities/units/construction_worker.rb
+++ b/lib/entities/units/construction_worker.rb
@@ -3,7 +3,7 @@ IMICRTS::Entity.define_entity(:construction_worker, :unit, 1000, "Constructs bui
   entity.has(:build_queue)
   entity.has(:sidebar_actions)
   [:power_plant, :refinery, :barracks, :war_factory, :helipad, :construction_yard].each do |ent|
-    entity.component(:sidebar_actions).add(:set_build_tool, :place_building, ent)
+    entity.component(:sidebar_actions).add(:set_tool, {tool: :place_entity, entity: ent, construction_worker: entity})
   end
 
   entity.radius = 14
diff --git a/lib/entity.rb b/lib/entity.rb
index 1652934..6994b35 100644
--- a/lib/entity.rb
+++ b/lib/entity.rb
@@ -18,7 +18,7 @@ class IMICRTS
     attr_reader :director, :player, :id, :name, :type, :speed
     attr_accessor :position, :angle, :radius, :target, :state,
                   :movement, :health, :max_health,
-                  :turret, :center, :particle_emitters
+                  :turret, :center, :particle_emitters, :color
     def initialize(name:, player:, id:, position:, angle:, director:)
       @player = player
       @id = id
@@ -26,6 +26,7 @@ class IMICRTS
       @angle = angle
       @director = director
       @speed = 0.5
+      @color = Gosu::Color.rgba(255, 255, 255, 255)
 
       @sight_radius = 5 # tiles
       @range_radius = 3 # tiles
@@ -104,6 +105,14 @@ class IMICRTS
       @position.distance(vector) < @radius + 1
     end
 
+    def die?
+      if @health
+        @health <= 0
+      else
+        false
+      end
+    end
+
     def render
       @render = Gosu.render(@shell_image.width, @shell_image.height, retro: true) do
         @body_image.draw(0, 0, 0) if @body_image
@@ -114,7 +123,7 @@ class IMICRTS
 
     def draw
       render unless @render
-      @render.draw_rot(@position.x, @position.y, @position.z, @angle, @center.x, @center.y)
+      @render.draw_rot(@position.x, @position.y, @position.z, @angle, @center.x, @center.y, 1, 1, @color)
 
       component(:turret).draw if component(:turret)
       @particle_emitters.each(&:draw)
diff --git a/lib/exts/string.rb b/lib/exts/string.rb
new file mode 100644
index 0000000..f8692a8
--- /dev/null
+++ b/lib/exts/string.rb
@@ -0,0 +1,5 @@
+class String
+  def to_snakecase
+    self.to_s.split("::").last.gsub(/([^A-Z])([A-Z]+)/,'\1_\2').downcase.to_sym
+  end
+end
\ No newline at end of file
diff --git a/lib/player.rb b/lib/player.rb
index a24b27a..653416c 100644
--- a/lib/player.rb
+++ b/lib/player.rb
@@ -1,9 +1,10 @@
 class IMICRTS
   class Player
-    attr_reader :id, :name, :color, :team, :entities, :orders, :camera
+    attr_reader :id, :name, :color, :team, :entities, :orders, :camera, :spawnpoint
     attr_reader :selected_entities
-    def initialize(id:, name: nil, color: Gosu::Color.rgb(rand(150..200), rand(100..200), rand(150..200)), team: nil)
+    def initialize(id:, spawnpoint:, name: nil, color: Gosu::Color.rgb(rand(150..200), rand(100..200), rand(150..200)), team: nil)
       @id = id
+      @spawnpoint = spawnpoint
       @name = name ? name : "Novice-#{id}"
       @color = color
       @team = team
diff --git a/lib/states/game.rb b/lib/states/game.rb
index 2969539..1d3bacb 100644
--- a/lib/states/game.rb
+++ b/lib/states/game.rb
@@ -3,14 +3,17 @@ class IMICRTS
     Overlay = Struct.new(:image, :position, :angle, :alpha)
 
     attr_reader :sidebar, :sidebar_actions, :overlays
+    attr_accessor :selected_entities
     def setup
       window.show_cursor = true
       @options[:networking_mode] ||= :host
 
-      @player = Player.new(id: 0)
-      @director = Director.new(game: self, map: Map.new(map_file: "maps/test_map.tmx"), networking_mode: @options[:networking_mode], players: [@player])
-      @entity_controller = EntityController.new(game: self, director: @director, player: @player)
+      @director = Director.new(game: self, map: Map.new(map_file: "maps/test_map.tmx"), networking_mode: @options[:networking_mode])
+      @player = Player.new(id: 0, spawnpoint: @director.map.spawnpoints.last)
+      @director.add_player(@player)
 
+      @selected_entities = []
+      @tool = set_tool(:entity_controller)
       @overlays = []
 
       @debug_info = CyberarmEngine::Text.new("", y: 10, z: Float::INFINITY, shadow_color: Gosu::Color.rgba(0, 0, 0, 200))
@@ -20,38 +23,8 @@ class IMICRTS
 
         label "SIDEBAR", text_size: 78, margin_bottom: 20
 
-        flow(width: 1.0) do
+        flow(width: 1.0, height: 1.0) do
           @sidebar_actions = stack(width: 0.9) do
-            button("Harvester", width: 1.0) do
-              @player.entities << Entity.new(
-                name: :harvester,
-                director: @director,
-                player: @player,
-                id: @player.next_entity_id,
-                position: CyberarmEngine::Vector.new(rand(window.width), rand(window.height), ZOrder::GROUND_VEHICLE),
-                angle: rand(360)
-              )
-            end
-            button("Construction Worker", width: 1.0) do
-              @player.entities << Entity.new(
-                name: :construction_worker,
-                director: @director,
-                player: @player,
-                id: @player.next_entity_id,
-                position: CyberarmEngine::Vector.new(rand(window.width), rand(window.height), ZOrder::GROUND_VEHICLE),
-                angle: rand(360)
-              )
-            end
-            button("Tank", width: 1.0) do
-              @player.entities << Entity.new(
-                name: :tank,
-                director: @director,
-                player: @player,
-                id: @player.next_entity_id,
-                position: CyberarmEngine::Vector.new(rand(window.width), rand(window.height), ZOrder::GROUND_VEHICLE),
-                angle: rand(360)
-              )
-            end
           end
 
           # Power meter
@@ -59,49 +32,17 @@ class IMICRTS
             background Gosu::Color::GREEN
           end
         end
-
-
-        button("Leave", width: 1.0, margin_top: 20) do
-          finalize
-          push_state(MainMenu)
-        end
       end
 
-      # 100.times { |i| [@c, @h, @t].sample.instance_variable_get("@block").call }
-      spawnpoint = @director.map.spawnpoints.last
+      # TODO: implement tools
       @director.spawn_entity(
         player_id: @player.id, name: :construction_yard,
-        position: CyberarmEngine::Vector.new(spawnpoint.x, spawnpoint.y, ZOrder::BUILDING)
+        position: CyberarmEngine::Vector.new(@player.spawnpoint.x, @player.spawnpoint.y, ZOrder::BUILDING)
       )
 
       @director.spawn_entity(
         player_id: @player.id, name: :construction_worker,
-        position: CyberarmEngine::Vector.new(spawnpoint.x - 64, spawnpoint.y + 64, ZOrder::GROUND_VEHICLE)
-      )
-
-      @director.spawn_entity(
-        player_id: @player.id, name: :power_plant,
-        position: CyberarmEngine::Vector.new(spawnpoint.x + 64, spawnpoint.y + 64, ZOrder::BUILDING)
-      )
-
-      @director.spawn_entity(
-        player_id: @player.id, name: :refinery,
-        position: CyberarmEngine::Vector.new(spawnpoint.x + 130, spawnpoint.y + 64, ZOrder::BUILDING)
-      )
-
-      @director.spawn_entity(
-        player_id: @player.id, name: :war_factory,
-        position: CyberarmEngine::Vector.new(spawnpoint.x + 130, spawnpoint.y - 64, ZOrder::BUILDING)
-      )
-
-      @director.spawn_entity(
-        player_id: @player.id, name: :helipad,
-        position: CyberarmEngine::Vector.new(spawnpoint.x - 32, spawnpoint.y - 96, ZOrder::BUILDING)
-      )
-
-      @director.spawn_entity(
-        player_id: @player.id, name: :barracks,
-        position: CyberarmEngine::Vector.new(spawnpoint.x - 32, spawnpoint.y + 128, ZOrder::BUILDING)
+        position: CyberarmEngine::Vector.new(@player.spawnpoint.x - 64, @player.spawnpoint.y + 64, ZOrder::GROUND_VEHICLE)
       )
     end
 
@@ -113,7 +54,7 @@ class IMICRTS
       @player.camera.draw do
         @director.map.draw(@player.camera)
         @director.entities.each(&:draw)
-        @entity_controller.selected_entities.each(&:selected_draw)
+        @selected_entities.each(&:selected_draw)
 
         @overlays.each do |overlay|
           overlay.image.draw_rot(overlay.position.x, overlay.position.y, overlay.position.z, overlay.angle, 0.5, 0.5, 1, 1, Gosu::Color.rgba(255, 255, 255, overlay.alpha))
@@ -123,7 +64,7 @@ class IMICRTS
           @overlays.delete(overlay) if overlay.alpha <= 0
         end
 
-        @entity_controller.draw
+        @tool.draw if @tool
       end
 
       @debug_info.draw if Setting.enabled?(:debug_info_bar)
@@ -134,7 +75,7 @@ class IMICRTS
 
       @director.update
       @player.camera.update
-      @entity_controller.update
+      @tool.update if @tool
 
       mouse = @player.camera.transform(window.mouse)
       tile  = @director.map.tile_at(mouse.x / @director.map.tile_size, mouse.y / @director.map.tile_size)
@@ -161,19 +102,23 @@ class IMICRTS
     def button_down(id)
       super
 
-      @entity_controller.button_down(id)
+      @tool.button_down(id) if @tool
       @player.camera.button_down(id) unless @sidebar.hit?(window.mouse_x, window.mouse_y)
     end
 
     def button_up(id)
       super
 
-      @entity_controller.button_up(id)
+      @tool.button_up(id) if @tool
       @player.camera.button_up(id)
     end
 
-    def set_tool(tool, *args)
-      pp tool, args
+    def set_tool(tool, data = {})
+      unless tool
+        set_tool(:entity_controller)
+      else
+        @tool = Tool.get(tool).new(data, game: self, director: @director, player: @player)
+      end
     end
 
     def finalize
diff --git a/lib/tool.rb b/lib/tool.rb
new file mode 100644
index 0000000..6d34857
--- /dev/null
+++ b/lib/tool.rb
@@ -0,0 +1,49 @@
+class IMICRTS
+  class Tool
+    @@tools = {}
+    def self.get(tool)
+      @@tools.dig(tool)
+    end
+
+    def self.inherited(subclass)
+      @@tools[subclass.to_s.to_snakecase] = subclass
+    end
+
+    attr_reader :game, :director, :player
+    def initialize(options = {}, game: nil, director: nil, player: nil)
+      @options = options
+      @game = game
+      @director = director
+      @player = player
+
+      setup
+    end
+
+    def setup
+    end
+
+    def draw
+    end
+
+    def update
+    end
+
+    def button_down(id)
+    end
+
+    def button_up(id)
+    end
+
+    def cost
+      return 0
+    end
+
+    def cancel_tool
+      @game.set_tool(nil)
+    end
+  end
+end
+
+Dir.glob("#{IMICRTS::GAME_ROOT_PATH}/lib/tools/**/*.rb").each do |tool|
+  require_relative tool
+end
\ No newline at end of file
diff --git a/lib/entity_controller.rb b/lib/tools/entity_controller.rb
similarity index 81%
rename from lib/entity_controller.rb
rename to lib/tools/entity_controller.rb
index 65cdeb4..05baeeb 100644
--- a/lib/entity_controller.rb
+++ b/lib/tools/entity_controller.rb
@@ -1,14 +1,8 @@
 class IMICRTS
-  # Handles entity de/selection and order manipulation
-  class EntityController
-    attr_reader :selected_entities
-    def initialize(game:, director:, player:)
-      @game = game
-      @director = director
-      @player = player
-
+  # Handles entity de/selection and basic move order
+  class EntityController < Tool
+    def setup
       @drag_start = CyberarmEngine::Vector.new
-      @selected_entities = []
     end
 
     def draw
@@ -46,7 +40,7 @@ class IMICRTS
           @selection_start = @player.camera.transform(@game.window.mouse)
         end
       when Gosu::MS_RIGHT
-        if @selected_entities.size > 0
+        if @game.selected_entities.size > 0
           @director.schedule_order(Order::MOVE, @player.id, @player.camera.transform(@game.window.mouse))
 
           @game.overlays << Game::Overlay.new(Gosu::Image.new("#{IMICRTS::ASSETS_PATH}/cursors/move.png"), @player.camera.transform(@game.window.mouse), 0, 255)
@@ -62,14 +56,14 @@ class IMICRTS
         @box = nil
         @selection_start = nil
 
-        diff = (@player.selected_entities - @selected_entities)
+        diff = (@player.selected_entities - @game.selected_entities)
 
         @director.schedule_order(Order::DESELECTED_UNITS, @player.id, diff) if diff.size > 0
-        if @selected_entities.size > 0
-          @director.schedule_order(Order::SELECTED_UNITS, @player.id, @selected_entities)
+        if @game.selected_entities.size > 0
+          @director.schedule_order(Order::SELECTED_UNITS, @player.id, @game.selected_entities)
         else
           pick_entity
-          if ent = @selected_entities.first
+          if ent = @game.selected_entities.first
             return unless ent.component(:sidebar_actions)
 
             @game.sidebar_actions.clear do |stack|
@@ -92,8 +86,8 @@ class IMICRTS
       end
 
       if found
-        @selected_entities = [found]
-        @director.schedule_order(Order::SELECTED_UNITS, @player.id, @selected_entities)
+        @game.selected_entities = [found]
+        @director.schedule_order(Order::SELECTED_UNITS, @player.id, @game.selected_entities)
       end
     end
 
@@ -107,9 +101,9 @@ class IMICRTS
       end
 
       if Gosu.button_down?(Gosu::KB_LEFT_SHIFT) || Gosu.button_down?(Gosu::KB_RIGHT_SHIFT)
-        @selected_entities = @selected_entities.union(selected_entities)
+        @game.selected_entities = @game.selected_entities.union(selected_entities)
       else
-        @selected_entities = selected_entities
+        @game.selected_entities = selected_entities
       end
     end
   end
diff --git a/lib/tools/place_entity.rb b/lib/tools/place_entity.rb
new file mode 100644
index 0000000..3f370cd
--- /dev/null
+++ b/lib/tools/place_entity.rb
@@ -0,0 +1,49 @@
+class IMICRTS
+  class PlaceEntity < Tool
+    attr_reader :entity, :construction_worker
+
+    def setup
+      @entity = @options[:entity]
+      @construction_worker = @options[:construction_worker]
+
+      @preview = Entity.new(name: @entity, player: @player, id: 0, position: CyberarmEngine::Vector.new, angle: 0, director: @director)
+    end
+
+    def draw
+      # TODO: draw affected tiles
+      @preview.draw
+    end
+
+    def update
+      # TODO: ensure that construction worker is alive
+      cancel_tool if @construction_worker.die?
+      @preview.position = @player.camera.transform(@game.window.mouse)
+      @preview.position.z = ZOrder::OVERLAY
+
+      @preview.color.alpha = 150
+    end
+
+    def button_down(id)
+      case id
+      when Gosu::MsRight
+        cancel_tool
+      end
+    end
+
+    def button_up(id)
+      case id
+      when Gosu::MsLeft
+        return if @game.sidebar.hit?(@game.window.mouse_x, @game.window.mouse_y)
+
+        transform = @player.camera.transform(@game.window.mouse)
+
+        @director.spawn_entity(
+          player_id: @player.id, name: @entity,
+          position: CyberarmEngine::Vector.new(transform.x, transform.y, ZOrder::BUILDING)
+        )
+
+        cancel_tool
+      end
+    end
+  end
+end
\ No newline at end of file
diff --git a/lib/tools/repair_entity.rb b/lib/tools/repair_entity.rb
new file mode 100644
index 0000000..0b7eb76
--- /dev/null
+++ b/lib/tools/repair_entity.rb
@@ -0,0 +1,9 @@
+class IMICRTS
+  class SellEntity < Tool
+    attr_accessor :entity
+
+    def setup
+      @entity = nil
+    end
+  end
+end
\ No newline at end of file
diff --git a/lib/tools/sell_entity.rb b/lib/tools/sell_entity.rb
new file mode 100644
index 0000000..0b7eb76
--- /dev/null
+++ b/lib/tools/sell_entity.rb
@@ -0,0 +1,9 @@
+class IMICRTS
+  class SellEntity < Tool
+    attr_accessor :entity
+
+    def setup
+      @entity = nil
+    end
+  end
+end
\ No newline at end of file