diff --git a/Makefile b/Makefile
index 388382b..ed9c351 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,8 @@ else
     src/02-drawing.pod \
     src/03-events.pod \
     src/04-game.pod \
-    src/05-pong.pod 
+    src/05-pong.pod \
+    src/06-tetris.pod
 endif
 
 default: prepare pdf clean
diff --git a/src/06-tetris.pod b/src/06-tetris.pod
index be22605..c3faadd 100644
--- a/src/06-tetris.pod
+++ b/src/06-tetris.pod
@@ -1,20 +1,51 @@
-=head0 The Basics
+=head0 Tetris 
 
-Making a screen:
+=head1 Data Structures
 
-=begin programlisting
+A design for data structures is very important to do before making a game.
+
+=head2 Considerations
+
+=head3 CPU
+
+Will the data structure be access in the game loop
+
+=head3 Memory
+
+Will it be loaded up a lot
+
+=head3 Programmer's Sanity
+
+Will it be gorkable to the programmer. 
+
+=head1 Game flow
+
+=head2 Considerations
+
+=head3 Refactor the first draft
+
+=head1 Collisions
+
+What is colliding to what?
+
+=head2 Considerations
+
+=head3 Dynamic 
+
+Are both colliders going to collide?
+
+=head3 Direction of Collisions
+
+Multiple directions of collisions?
+
+=head3 Game Events
+
+Should they trigger a game event? React?
+
+=head2 The Game
 
-    use SDL;
-    use SDLx::App;
 
-    SDLx::App->new();
-  
-    sleep( 2 );
-    
-=end programlisting
 
-This makes a screen as below:
 
-WIP
 
 =for vim: spell