diff --git a/ch01/lesson-12.org b/ch01/lesson-12.org
index 8973926..79e6ae8 100644
--- a/ch01/lesson-12.org
+++ b/ch01/lesson-12.org
@@ -32,13 +32,15 @@
 - Inspector->AnimatedSprite2D->Animation->Frame
 - scroll through the frames to see if they fit the collision shape properly
 
-** modify the player script to handle the collision
+** */method 1/*: using character bodies and collision shapes
 
 *** default collision code
 - default collision handling occurs between two CharacterBody2D nodes
 - limits each others movements
 - occurs after the =move_and_slide= function is called
 
+*NOTE: you are not expected to put this into the script!!!*
+
 #+begin_src godot
 # Using move_and_collide.
 var collision = move_and_collide(velocity * delta)
@@ -75,6 +77,140 @@ func _physics_process(delta):
     updateAnimation()
 #+end_src
 
+*** problems
+- the player sprite might only have the shape on the lower part of his body and not the upper
+  - this is to allow him to move the body against a tree or other object and only block by the feet
+- this causes the enemy sprite to walk directly through the player
+
+** layer and mask
+
+*** change collision layer and mask for players
+- [Player Root Node]->Inspector->CharacterBody2D->Layers
+- How Layers work
+  - the numbers of the layers selected determines what he looks for
+  - you can change the name of the layer by clicking on the three dots to the right
+- change the layers names
+  - Layer 1: 'player'
+  - Layer 2: 'enemy'
+
+*** change the collision layer and mask for enemies
+- [Enemy Sprite] -> [Enemy Root Node] -> Inspector -> CollisionObject2D -> Collision -> Layers
+- move the sprites layer and mask to '2'
+
+*** enabling enemy sprites to collide with tilemap
+- make all enemy sprites children of the tilemap
+- [Tilemap Node] -> Inspector -> TileMapLayer -> TILESET
+  - INSIDE the "tileset" dropdown, click on whatever element was selected
+  - this will open up the physics layer
+  - set the layers and masks to /*BOTH*/ "1" and "2"
+
+** method2: hurt box and hit box
+*** basic
+- add hurt box to player
+- add hit box to enemy
+
+*** create hurt box
+- add Area2D node to [Player Scene]
+  - you can rename it 'hurtBox'
+- add a CollisionShape2D to the Area2D node
+  - [hurtBox node] -> CollisionsShape2D -> Inspector -> CollisionShape2D -> Shape
+    - select what shape you want from the dropdown box
+- set the collision properties for the hurt box
+  - [hurtBox node] -> CollisionObject2D -> Collision
+  - set /*ONLY*/ the mask to "1" and "2"
+
+*** create hit box
+- go to NPC sprite
+- add Area2D node
+  - rename 'hitBox'
+  - add CollisionShape2D to Area2D node
+    - rotate it 90
+
+* in the case where animation frames change shape
+
+** modify sprite scene
+- add AnimationPlayer node to scene
+- remove AnimatedSprite2D
+- add regular Sprite2D node
+  - set texture on sprite
+    - drag sprite texture to Sprite2D->Inspector->Sprite2D->Texture
+  - set Hframes and Vframes correctly
+    - Sprite2D->Inspector->Sprite2D->Animation
+
+  - move sprite up over center of scene
+
+** MOVE THE AREA2D FOR PROPER DRAWING
+- area2D node must be lower than the Sprite2D node
+- this will draw it on top of the sprite
+- make it easier to animate properly
+
+** modify AnimationPlayer node
+- select node
+- in lower pane, find "Animation" dropdown
+  - select "New"
+  - call it "walkDown"
+#+attr_html: :width 400px
+[[../../_share/media/img/ch12/g12_animation.png]]
+
+- set snap to 0.2
+  #+attr_html: :width 400px
+  [[../../_share/media/img/ch12/animation_snap.png]]
+
+** add sprite animations
+- [Sprite2D node] -> Inspector -> Sprite2D -> Animation
+- select the X and Y of Frame Coords
+- click the key button
+  #+attr_html: :width 250px
+  [[../../_share/media/img/ch12/frame_coords.png]]
+
+- screen should look like
+  #+attr_html: :width 600px
+  [[../../_share/media/img/ch12/animation_timeline.png]]
+
+- set animation length to 0.8
+- enable looping
+  #+attr_html: :width 600px
+  [[../../_share/media/img/ch12/length_looping.png]]
+
+** add collision detection to the frames
+- select Area2D->CollisionShape2D node
+- Inspector-> Node2D-> Transform
+- make sure the bottom animation panel is visible
+  - select the first frame
+- lock properties to the frames using key buttons
+  - position
+  - scale
+
+    #+attr_html: :width 250px
+    [[../../_share/media/img/ch12/lock_properties.png]]
+
+    #+attr_html: :width 600px
+    [[../../_share/media/img/ch12/lock_animation.png]]
+
+*** go to the next FRAME in the animation panel
+- adjust the shape of the collision area
+- lock the properties as before
+
+*** changing shape
+- changing shape is IMPOSSIBLE
+  - we must change scale
+- click the chains to allow you to change x and y axis independently
+- click on the text box for each to change it
+
+*** discreate changes
+- the shape will appear to not change properly with the sprite
+- this is because it's update mode is set to 'continuous'
+- change it to discrete on both scaling and positioning
+  #+attr_html: :width 300px
+  [[../../_share/media/img/ch12/discrete.png]]
+
+*** update the rest of the animations
+- duplicate the current animation
+- modify and set whatever properties are necessary for each animation
+
+** modify script
+- set the animations variable from $AnimatedSprite2D to $AnimationPlayer
+
 * Video Contents
 
 [[https://www.youtube.com/watch?v=WVQkOWY3zxQ][Lesson Link]]