diff --git a/engine/scene.py b/engine/scene.py
index 7f2bbe2..ede4c0f 100644
--- a/engine/scene.py
+++ b/engine/scene.py
@@ -1,11 +1,11 @@
 class Scene:
     def __init__(self):
-        self.entities = []
+        self.entities = {}
 
     def unload(self):
-        for entity in self.entities:
+        for entity in self.entities.values():
             entity.unregister()
 
     def load(self):
-        for entity in self.entities:
+        for entity in self.entities.values():
             entity.register()
diff --git a/engine/scene_manager.py b/engine/scene_manager.py
index 9d6e339..60c19eb 100644
--- a/engine/scene_manager.py
+++ b/engine/scene_manager.py
@@ -4,15 +4,15 @@ from .singleton import Singleton
 class SceneManager(metaclass=Singleton):
     def __init__(self, scene):
         super().__init__()
-        self._scene = scene
-        self._scene.load()
+        self.scene = scene
+        self.scene.load()
 
     def change_scene(self, new_scene):
-        self._scene.unload()
-        self._scene = new_scene
-        self._scene.load()
+        self.scene.unload()
+        self.scene = new_scene
+        self.scene.load()
 
     def step(self):
-        for entity in self._scene.entities:
+        for entity in self.scene.entities.values():
             if entity.script is not None:
                 entity.script(entity)
diff --git a/engine/servers/physics.py b/engine/servers/physics.py
index 38a57e7..4f3b55e 100644
--- a/engine/servers/physics.py
+++ b/engine/servers/physics.py
@@ -30,6 +30,7 @@ class PhysicsServer(Server):
             x_step = -1 if d.vx < 0 else 1
             y_step = -1 if d.vy < 0 else 1
             for i in range(abs(d.vx)):
+                d.parent.x += x_step
                 c = self._check_collide(d)
                 if c is not None:
                     if c.cb:
@@ -38,8 +39,8 @@ class PhysicsServer(Server):
                         d.parent.x -= x_step
                         d.vx = 0
                         break
-                d.parent.x += x_step
             for i in range(abs(d.vy)):
+                d.parent.y += y_step
                 c = self._check_collide(d)
                 if c is not None:
                     if c.cb:
@@ -48,6 +49,3 @@ class PhysicsServer(Server):
                         d.parent.y -= y_step
                         d.vy = 0
                         break
-                d.parent.y += y_step
-            # d.vx = 0
-            # d.vy = 0
diff --git a/res/ghost.png b/res/ghost.png
new file mode 100644
index 0000000..bc57150
Binary files /dev/null and b/res/ghost.png differ
diff --git a/scenes/lvl0.py b/scenes/lvl0.py
index a65da24..09e4614 100644
--- a/scenes/lvl0.py
+++ b/scenes/lvl0.py
@@ -4,6 +4,7 @@ from engine.entity import Entity
 from engine.components.sprite import Sprite
 from engine.components.collide_rect import CollideRect
 from engine.servers.graphics import GraphicsServer
+from engine.scene_manager import SceneManager
 from pygame import Rect
 from pygame import image
 from pygame import Surface
@@ -33,12 +34,41 @@ class PacDot(Entity):
         self.unregister()
 
 
+def path(start, tgt, x, y, trace, length):
+    if start == tgt:
+        return length
+    if start is None or trace[y][x]:
+        return False
+    trace[y][x] = True
+    u = path(start.up, tgt, x, y-1, trace, length + 1)
+    d = path(start.down, tgt, x, y+1, trace, length + 1)
+    l = path(start.left, tgt, x-1, y, trace, length + 1)
+    r = path(start.right, tgt, x+1, y, trace, length + 1)
+    best = None
+    for subpath in (u, d, l, r):
+        if subpath and (best is None or subpath < best):
+            best = subpath
+    return best
+
+
+class Node():
+    def __init__(self):
+        self.up = None
+        self.down = None
+        self.left = None
+        self.right = None
+
+
+graph = None
+
+
 class Level(Entity):
     def __init__(self, path):
         super().__init__()
         desc = image.load(res(path))
         w, h = desc.get_size()
         GraphicsServer().resize((w * S, h * S))
+        # graph = [[None for x in range(w)] for y in range(h)]
         self.surf = Surface((w * S, h * S)).convert()
         self.surf.fill((0, 0, 0))
         wall = Surface((S, S)).convert()
@@ -53,6 +83,20 @@ class Level(Entity):
                 pc.x = x * S
                 pc.y = y * S
                 entities.append(pc)
+            # elif col == (0, 0, 0):
+            #     graph[y][x] = Node()
+        # for y, line in enumerate(graph):
+        #     for x, node in enumerate(line):
+        #         if node is None:
+        #             continue
+        #         if x > 0:
+        #             node.left = graph[y][x-1]
+        #         if x < w:
+        #             node.right = graph[y][x+1]
+        #         if y > 0:
+        #             node.up = graph[y-1][x]
+        #         if y < h:
+        #             node.down = graph[y+1][y]
         Sprite(self, self.surf, 0)
 
 
@@ -67,12 +111,19 @@ class MovingEntity(Entity):
 
 
 class Ghost(MovingEntity):
-    def update_ghost():
-        pass
-
     def __init__(self):
         super().__init__(image.load(res('ghost.png')).convert())
-        self.script = update_ghost()
+        self.script = Ghost.script
+
+    def script(self):
+        # cur_node = graph[self.y//S][self.x//S]
+        pacman = SceneManager().scene.entities['pacman']
+        # pacman_node = graph[pacman.y//S][pacman.x//S]
+        x_dist = pacman.x - self.x
+        y_dist = pacman.y - self.y
+        s = 1
+        self.phys.vx = s if x_dist > 0 else -s
+        self.phys.vy = s if y_dist > 0 else -s
 
 
 class Lvl0(Scene):
@@ -105,10 +156,13 @@ class Lvl0(Scene):
         pacman.phys.rect.w = S//T
         pacman.phys.rect.h = S//T
 
-        self.entities.append(Level('lvl0.png'))
-        for entity in entities:
-            self.entities.append(entity)
-        self.entities.append(pacman)
+        self.entities['level'] = Level('lvl0.png')
+        for i, entity in enumerate(entities):
+            self.entities[f'pacdot-{i}'] = entity
+        self.entities['pacman'] = pacman
+        self.entities['ghost'] = Ghost()
+        self.entities['ghost'].x = S*6
+        self.entities['ghost'].y = S*2
 
         super().load()