diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index a248e7e..46cf21b 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -3,8 +3,7 @@ class ApplicationController < ActionController::Base
   include Pundit::Authorization
 
   before_action :set_title, :set_current_user
-  # TODO: add later
-  # after_action :verify_authorized
+  after_action :verify_authorized
 
   # Only allow modern browsers supporting webp images, web push, badges, import maps, CSS nesting, and CSS :has.
   allow_browser versions: :modern
diff --git a/app/controllers/completions_controller.rb b/app/controllers/completions_controller.rb
index 92769de..77e03a8 100644
--- a/app/controllers/completions_controller.rb
+++ b/app/controllers/completions_controller.rb
@@ -4,10 +4,14 @@ class CompletionsController < ApplicationController
   before_action :set_completion, only: %i[ destroy edit update ]
 
   def edit
+    authorize @contest
+
     @title = "Edit completion"
   end
 
   def new
+    authorize @contest
+
     @completion = Completion.new
     if params[:contestant_id]
       @completion.contestant_id = params[:contestant_id]
@@ -16,6 +20,8 @@ class CompletionsController < ApplicationController
   end
 
   def create
+    authorize @contest
+
     @completion = Completion.new(completion_params)
     @completion.contest_id = @contest.id
     if @completion.save
@@ -29,6 +35,8 @@ class CompletionsController < ApplicationController
   end
 
   def update
+    authorize @contest
+
     if params[:contestant_id]
       @completion.contestant_id = params[:contestant_id]
     end
@@ -41,6 +49,8 @@ class CompletionsController < ApplicationController
   end
 
   def destroy
+    authorize @contest
+
     @completion.destroy
     if params[:contestant_id]
       redirect_to contest_contestant_path(@contest, params[:contestant_id])
diff --git a/app/controllers/contestants_controller.rb b/app/controllers/contestants_controller.rb
index ef95891..bed28ec 100644
--- a/app/controllers/contestants_controller.rb
+++ b/app/controllers/contestants_controller.rb
@@ -4,15 +4,21 @@ class ContestantsController < ApplicationController
   before_action :set_completions, only: %i[edit update ]
 
   def edit
+    authorize @contest
+
     @title = "Contestant"
   end
 
   def new
+    authorize @contest
+
     @contestant = Contestant.new
     @title = "New contestant"
   end
 
   def create
+    authorize @contest
+
     @contestant = Contestant.new(contestant_params)
     @contestant.contest_id = @contest.id
     if @contestant.save
@@ -24,6 +30,8 @@ class ContestantsController < ApplicationController
   end
 
   def update
+    authorize @contest
+
     if @contestant.update(contestant_params)
       redirect_to @contest
     else
@@ -33,6 +41,8 @@ class ContestantsController < ApplicationController
   end
 
   def destroy
+    authorize @contest
+
     @contestant.destroy
     redirect_to contest_path(@contest)
   end
diff --git a/app/controllers/contests_controller.rb b/app/controllers/contests_controller.rb
index 93f0493..6d7928b 100644
--- a/app/controllers/contests_controller.rb
+++ b/app/controllers/contests_controller.rb
@@ -2,11 +2,15 @@ class ContestsController < ApplicationController
   before_action :set_contest, only: %i[ destroy edit show update ]
 
   def index
+    authorize :contest
+
     @contests = current_user.contests
     @title = "Welcome #{current_user.username}!"
   end
 
   def show
+    authorize @contest
+
     @title = @contest.name
     @contestants = @contest.contestants.order(:name)
     @puzzles = @contest.puzzles.order(:id)
@@ -14,15 +18,21 @@ class ContestsController < ApplicationController
   end
 
   def edit
+    authorize @contest
+
     @title = "Edit contest settings"
   end
 
   def new
+    authorize :contest
+
     @contest = Contest.new
     @title = "New jigsaw puzzle competition"
   end
 
   def create
+    authorize :contest
+
     @contest = Contest.new(contest_params)
     @contest.user_id = current_user.id
     if @contest.save
@@ -33,6 +43,8 @@ class ContestsController < ApplicationController
   end
 
   def update
+    authorize @contest
+
     if @contest.update(contest_params)
       redirect_to @contest
     else
@@ -41,6 +53,7 @@ class ContestsController < ApplicationController
   end
 
   def destroy
+    authorize @contest
   end
 
   private
diff --git a/app/controllers/puzzles_controller.rb b/app/controllers/puzzles_controller.rb
index c30bae3..c105d67 100644
--- a/app/controllers/puzzles_controller.rb
+++ b/app/controllers/puzzles_controller.rb
@@ -3,15 +3,21 @@ class PuzzlesController < ApplicationController
   before_action :set_puzzle, only: %i[ destroy edit update]
 
   def edit
+    authorize @contest
+
     @title = "Edit contest puzzle"
   end
 
   def new
+    authorize @contest
+
     @puzzle = Puzzle.new
     @title = "New contest puzzle"
   end
 
   def create
+    authorize @contest
+
     @puzzle = Puzzle.new(puzzle_params)
     @puzzle.contest_id = @contest.id
     if @puzzle.save
@@ -23,6 +29,8 @@ class PuzzlesController < ApplicationController
   end
 
   def update
+    authorize @contest
+
     if @puzzle.update(puzzle_params)
       redirect_to @contest
     else
@@ -32,6 +40,8 @@ class PuzzlesController < ApplicationController
   end
 
   def destroy
+    authorize @contest
+
     @puzzle.destroy
     redirect_to contest_path(@contest)
   end
diff --git a/app/controllers/sessions_controller.rb b/app/controllers/sessions_controller.rb
index 9785c92..13595bc 100644
--- a/app/controllers/sessions_controller.rb
+++ b/app/controllers/sessions_controller.rb
@@ -3,9 +3,11 @@ class SessionsController < ApplicationController
   rate_limit to: 10, within: 3.minutes, only: :create, with: -> { redirect_to new_session_url, alert: "Try again later." }
 
   def new
+    skip_authorization
   end
 
   def create
+    skip_authorization
     if user = User.authenticate_by(params.permit(:email_address, :password))
       start_new_session_for user
       redirect_to after_authentication_url
diff --git a/app/policies/completion_policy.rb b/app/policies/completion_policy.rb
new file mode 100644
index 0000000..9ed51d7
--- /dev/null
+++ b/app/policies/completion_policy.rb
@@ -0,0 +1,9 @@
+class CompletionPolicy < ContestPolicy
+  def index?
+    false
+  end
+
+  def show?
+    false
+  end
+end
diff --git a/app/policies/contest_policy.rb b/app/policies/contest_policy.rb
new file mode 100644
index 0000000..d6a9d0a
--- /dev/null
+++ b/app/policies/contest_policy.rb
@@ -0,0 +1,29 @@
+class ContestPolicy < ApplicationPolicy
+  def index?
+    true
+  end
+
+  def show?
+    record.user.id == user.id || user.admin?
+  end
+
+  def new?
+    true
+  end
+
+  def create?
+    true
+  end
+
+  def edit?
+    record.user.id == user.id || user.admin?
+  end
+
+  def update?
+    record.user.id == user.id || user.admin?
+  end
+
+  def destroy?
+    record.user.id == user.id || user.admin?
+  end
+end
diff --git a/app/policies/contestant_policy.rb b/app/policies/contestant_policy.rb
new file mode 100644
index 0000000..1b35919
--- /dev/null
+++ b/app/policies/contestant_policy.rb
@@ -0,0 +1,9 @@
+class ContestantPolicy < ContestPolicy
+  def index?
+    false
+  end
+
+  def show?
+    false
+  end
+end
diff --git a/app/policies/puzzle_policy.rb b/app/policies/puzzle_policy.rb
new file mode 100644
index 0000000..16e7645
--- /dev/null
+++ b/app/policies/puzzle_policy.rb
@@ -0,0 +1,9 @@
+class PuzzlePolicy < ContestPolicy
+  def index?
+    false
+  end
+
+  def show?
+    false
+  end
+end
diff --git a/app/views/contests/index.html.slim b/app/views/contests/index.html.slim
index 774e0cc..16b0fa4 100644
--- a/app/views/contests/index.html.slim
+++ b/app/views/contests/index.html.slim
@@ -15,9 +15,10 @@
         .card-header
           = contest.name
         .card-body
+          .card-text.mb-2 = "#{contest.puzzles.length} puzzles - #{contest.contestants.length} participants"
           .row
-            - contest.puzzles.each do |puzzle|
-              - if puzzle.image.attached?
-                .col
-                  = image_tag puzzle.image, style: "max-height: 80px;"
+            .col
+              - contest.puzzles.each do |puzzle|
+                - if puzzle.image.attached?
+                  = image_tag puzzle.image, style: "max-height: 50px;", class: "mb-2 me-2"
           a.stretched-link href=contest_path(contest)
\ No newline at end of file