diff --git a/lib/gamification_plugin.rb b/lib/gamification_plugin.rb
index d930925..26c3fc1 100644
--- a/lib/gamification_plugin.rb
+++ b/lib/gamification_plugin.rb
@@ -14,6 +14,19 @@ class GamificationPlugin < Noosfero::Plugin
     end
   end
 
+  # Override initial rules with environment specific rules
+  def self.gamification_set_rules(environment)
+    Merit::AppPointRules.clear
+    Merit::AppPointRules.merge!(Merit::PointRules.new(environment).defined_rules)
+  end
+
+  def application_controller_filters
+    [{
+      :type => 'before_filter', :method_name => 'gamification_set_rules',
+      :options => {}, :block => proc { GamificationPlugin.gamification_set_rules(environment) }
+    }]
+  end
+
   Merit.setup do |config|
     config.checks_on_each_request = false
     config.user_model_name = 'Profile'
diff --git a/lib/merit/point_rules.rb b/lib/merit/point_rules.rb
index d940faa..7b9b6a1 100644
--- a/lib/merit/point_rules.rb
+++ b/lib/merit/point_rules.rb
@@ -1,13 +1,3 @@
-# Be sure to restart your server when you modify this file.
-#
-# Points are a simple integer value which are given to "meritable" resources
-# according to rules in +app/models/merit/point_rules.rb+. They are given on
-# actions-triggered, either to the action user or to the method (or array of
-# methods) defined in the +:to+ option.
-#
-# 'score' method may accept a block which evaluates to boolean
-# (recieves the object as parameter)
-
 module Merit
   class PointRules
     include Merit::PointRulesMethods
@@ -47,7 +37,8 @@ module Merit
 
     # FIXME get value from environment
     def weight(category)
-      AVAILABLE_RULES[category][:default_weight]
+      settings = Noosfero::Plugin::Settings.new(@environment, GamificationPlugin)
+      settings.settings.fetch(:point_rules, {}).fetch(category.to_s, {}).fetch('weight', AVAILABLE_RULES[category][:default_weight]).to_i
     end
 
     def calculate_score(target, category, value)
@@ -55,8 +46,10 @@ module Merit
       weight(category) * value
     end
 
-    # TODO receive environment parameter
-    def initialize
+    def initialize(environment=nil)
+      return if environment.nil?
+      @environment = environment
+
       AVAILABLE_RULES.each do |category, setting|
         [setting[:action], setting[:undo_action]].compact.zip([1, -1]).each do |action, signal|
           score lambda {|target| signal * calculate_score(target, category, setting[:value])}, :on => action, :to => setting[:to], :category => category
diff --git a/test/functional/application_controller_test.rb b/test/functional/application_controller_test.rb
new file mode 100644
index 0000000..47d84fc
--- /dev/null
+++ b/test/functional/application_controller_test.rb
@@ -0,0 +1,20 @@
+require_relative '../test_helper'
+require 'test_controller'
+
+class TestController; def rescue_action(e) raise e end; end
+
+class ApplicationControllerTest < ActionController::TestCase
+
+  def setup
+    @environment = Environment.default
+    @environment.enable_plugin(GamificationPlugin)
+    @controller = TestController.new
+    @controller.stubs(:environment).returns(@environment)
+  end
+
+  should 'redefine rules in before filter' do
+    get :index
+    assert Merit::AppPointRules.present?
+  end
+
+end
diff --git a/test/unit/article_test.rb b/test/unit/article_test.rb
index d594669..3a8e019 100644
--- a/test/unit/article_test.rb
+++ b/test/unit/article_test.rb
@@ -4,6 +4,7 @@ class ArticleTest < ActiveSupport::TestCase
 
   def setup
     @person = create_user('testuser').person
+    GamificationPlugin.gamification_set_rules(Environment.default)
   end
 
   attr_accessor :person
diff --git a/test/unit/comment_test.rb b/test/unit/comment_test.rb
index c82190b..6d57062 100644
--- a/test/unit/comment_test.rb
+++ b/test/unit/comment_test.rb
@@ -5,6 +5,7 @@ class CommentTest < ActiveSupport::TestCase
   def setup
     @person = create_user('testuser').person
     @article = create(TextileArticle, :profile_id => person.id)
+    GamificationPlugin.gamification_set_rules(Environment.default)
   end
   attr_accessor :person, :article
 
diff --git a/test/unit/point_rules_test.rb b/test/unit/point_rules_test.rb
new file mode 100644
index 0000000..7553195
--- /dev/null
+++ b/test/unit/point_rules_test.rb
@@ -0,0 +1,34 @@
+require_relative "../test_helper"
+
+class PointRulesTest < ActiveSupport::TestCase
+
+  def setup
+    @environment = Environment.default
+    @point_rules = Merit::PointRules.new(@environment)
+  end
+
+  attr_accessor :environment, :point_rules
+
+  should 'not define rules when environment is nil' do
+    point_rules = Merit::PointRules.new
+    assert point_rules.defined_rules.blank?
+  end
+
+  should 'define rules when environment is present' do
+    assert point_rules.defined_rules.present?
+  end
+
+  should 'weight returns the default value when value is not setted in environment' do
+    Merit::PointRules::AVAILABLE_RULES.each do |category, setting|
+      assert_equal setting[:default_weight], point_rules.weight(category)
+    end
+  end
+
+  should 'weight returns value from environment when it is setted' do
+    settings = Noosfero::Plugin::Settings.new(environment, GamificationPlugin, {})
+    settings.set_setting(:point_rules, {'comment_author' => {'weight' => '500'}})
+    settings.save!
+    assert_equal 500, point_rules.weight(:comment_author)
+  end
+
+end
--
libgit2 0.21.2