diff --git a/src/map.cr b/src/map.cr
index 7d817a9..c3b67d0 100644
--- a/src/map.cr
+++ b/src/map.cr
@@ -25,6 +25,10 @@ abstract class Tile
     @point
   end
 
+  def cap
+    @cap
+  end
+
   def cur
     @cur
   end
@@ -81,10 +85,12 @@ class ForesterHouseTile < Tile
 end
 
 class Map
+  SIZE = 4
+
   def initialize
     @data = {} of String => Tile
-    (0...4).each do |x|
-      (0...4).each do |y|
+    (0...SIZE).each do |x|
+      (0...SIZE).each do |y|
         self.set(GrassTile.new(Point.new(x, y)))
       end
     end
@@ -105,45 +111,46 @@ class Map
     @data[key(point)] = tile
   end
 
-  def nearest_wood(point : Point) : Point | Nil
+  def tiles
+    (0...SIZE).each do |x|
+      (0...SIZE).each do |y|
+        point = Point.new(x, y)
+        tile = self.get(point)
+        yield point, tile
+      end
+    end
+  end
+
+  def nearest_point(point : Point, &block) : Point | Nil
     p = nil
-    d = 99999
-    (0...4).each do |x|
-      (0...4).each do |y|
-        tile = self.get(Point.new(x, y))
-        if tile.letter == 'f' && tile.cur > 0
-          td = Point.new(x, y).distance(point)
-          if td < d
-            d = td
-            p = Point.new(x, y)
-          end
+    d = Int32::MAX
+    tiles do |tile_point, tile|
+      if (yield tile)
+        tile_dist = tile_point.distance(point)
+        if tile_dist < d
+          d = tile_dist
+          p = tile_point
         end
       end
     end
     p
   end
 
+  def nearest_wood(point : Point) : Point | Nil
+    nearest_point point do |tile|
+      tile.letter == 'f' && tile.cur > 0
+    end
+  end
+
   def nearest_any_wood(point : Point) : Point | Nil
-    p = nil
-    d = 99999
-    (0...4).each do |x|
-      (0...4).each do |y|
-        tile = self.get(Point.new(x, y))
-        if tile.letter == 'f'
-          td = Point.new(x, y).distance(point)
-          if td < d
-            d = td
-            p = Point.new(x, y)
-          end
-        end
-      end
+    nearest_point point do |tile|
+      tile.letter == 'f' && tile.cur < tile.cap
     end
-    p
   end
 
   def print
-    (0...4).each do |x|
-      (0...4).each do |y|
+    (0...SIZE).each do |x|
+      (0...SIZE).each do |y|
         printf "%c", @data[key(Point.new(x, y))].letter
       end
       printf "\n"
diff --git a/src/queue.cr b/src/queue.cr
index 4ae64fe..61785a1 100644
--- a/src/queue.cr
+++ b/src/queue.cr
@@ -3,12 +3,12 @@ class App::CommandQueue
     @data = [] of NamedTuple(ts: Int32, cmd: Command)
   end
 
+  # Plan finishing of *command* at time *ts*
   def push(ts : Int32, cmd : Command)
     @data.push({ts: ts, cmd: cmd})
     @data.sort! do |a, b|
       b[:ts] <=> a[:ts]
     end
-    # puts @data
   end
 
   def pop(ts : Int32)
diff --git a/src/village.cr b/src/village.cr
index 4e75ee3..179e454 100644
--- a/src/village.cr
+++ b/src/village.cr
@@ -1,3 +1,4 @@
+require "colorize"
 require "./queue"
 require "./map"
 
@@ -161,10 +162,10 @@ class World
       if item.nil?
         break
       end
-      cmd_ts, cmd = item[:ts], item[:cmd]
-      @ts = cmd_ts
-      printf "world : %d : finish `%s`\n", @ts, typeof(cmd)
-      cmd.finish(self)
+      command_ts, command = item[:ts], item[:cmd]
+      @ts = command_ts
+      command.finish(self)
+      printf "world : %d : finish `%s`\n", @ts, typeof(command)
     end
   end
 end
@@ -173,5 +174,5 @@ w = World.new
 w.map.print
 w.push(BuildWoodMillCommand.new(Point.new(0, 0)))
 w.push(BuildForesterHouseCommand.new(Point.new(0, 0)))
-w.run(120)
+w.run(60)
 printf "Wood: %d\n", w.resources.wood