diff --git a/engine/components/collide_rect.py b/engine/components/collide_rect.py
index d4fc82a..3ca7d8d 100644
--- a/engine/components/collide_rect.py
+++ b/engine/components/collide_rect.py
@@ -3,7 +3,7 @@ from ..servers.physics import PhysicsServer
 
 
 class CollideRect(Component):
-    def __init__(self, parent, rect, static=True, solid=True):
+    def __init__(self, parent, rect, static=True, solid=True, cb=None):
         super().__init__(parent)
         self.rect = rect
         def x_change_cb(x):
@@ -14,6 +14,7 @@ class CollideRect(Component):
         parent.subscribe('y', y_change_cb)
         self.static = static
         self.solid = solid
+        self.cb = cb
         self.vx = 0
         self.vy = 0
 
@@ -21,4 +22,4 @@ class CollideRect(Component):
         PhysicsServer().register_component(self)
 
     def unregister(self):
-        PhysicsServer().register_component(self)
+        PhysicsServer().unregister_component(self)
diff --git a/engine/components/sprite.py b/engine/components/sprite.py
index 6f1d72f..0fbfca4 100644
--- a/engine/components/sprite.py
+++ b/engine/components/sprite.py
@@ -13,4 +13,4 @@ class Sprite(Component):
         GraphicsServer().register_component(self)
 
     def unregister(self):
-        GraphicsServer().register_component(self)
+        GraphicsServer().unregister_component(self)
diff --git a/engine/servers/physics.py b/engine/servers/physics.py
index 4390f0e..38a57e7 100644
--- a/engine/servers/physics.py
+++ b/engine/servers/physics.py
@@ -8,39 +8,46 @@ class PhysicsServer(Server):
         self._dynamic = []
 
     def register_component(self, component):
-        if component.solid:
-            if component.static:
-                self._static.append(component)
-            else:
-                self._dynamic.append(component)
+        if component.static:
+            self._static.append(component)
         else:
-            self._area.append(component)
+            self._dynamic.append(component)
 
     def unregister_component(self, component):
-        self._static.remove(component)
-        self._dynamic.remove(component)
+        if component in self._static:
+            self._static.remove(component)
+        if component in self._dynamic:
+            self._dynamic.remove(component)
 
-    def _check_collide(self, rect):
-        for s in self._static:
-            if s.rect.colliderect(rect):
-                return True
-        return False
+    def _check_collide(self, dyn):
+        for s in self._static + self._dynamic:
+            if s != dyn and s.rect.colliderect(dyn.rect):
+                return s
+        return None
 
     def step(self):
         for d in self._dynamic:
             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)):
-                if self._check_collide(d.rect):
-                    d.parent.x -= x_step
-                    d.vx = 0
-                    break
+                c = self._check_collide(d)
+                if c is not None:
+                    if c.cb:
+                        c.cb()
+                    if c.solid:
+                        d.parent.x -= x_step
+                        d.vx = 0
+                        break
                 d.parent.x += x_step
             for i in range(abs(d.vy)):
-                if self._check_collide(d.rect):
-                    d.parent.y -= y_step
-                    d.vy = 0
-                    break
+                c = self._check_collide(d)
+                if c is not None:
+                    if c.cb:
+                        c.cb()
+                    if c.solid:
+                        d.parent.y -= y_step
+                        d.vy = 0
+                        break
                 d.parent.y += y_step
             # d.vx = 0
             # d.vy = 0
diff --git a/res/lvl0.png b/res/lvl0.png
index 503e9b9..aa7e2ea 100644
Binary files a/res/lvl0.png and b/res/lvl0.png differ
diff --git a/scenes/lvl0.py b/scenes/lvl0.py
index 25b51e0..a65da24 100644
--- a/scenes/lvl0.py
+++ b/scenes/lvl0.py
@@ -15,6 +15,24 @@ from itertools import product
 
 S=20
 
+
+entities=[]
+
+
+class PacDot(Entity):
+    s = Surface((S, S))
+    draw.circle(s, (255, 255, 0), (S//2, S//2), S//4)
+
+    def __init__(self):
+        super().__init__()
+        CollideRect(self, Rect(0, 0, S, S),
+                    static=True, solid=False, cb=self.cb)
+        Sprite(self, PacDot.s, 1)
+
+    def cb(self):
+        self.unregister()
+
+
 class Level(Entity):
     def __init__(self, path):
         super().__init__()
@@ -26,16 +44,22 @@ class Level(Entity):
         wall = Surface((S, S)).convert()
         wall.fill((0, 0, 255))
         for x, y in product(range(w), range(h)):
-            if desc.get_at((x, y)) == (0, 0, 255):
+            col = desc.get_at((x, y))
+            if col == (0, 0, 255):
                 CollideRect(self, Rect(x * S, y * S, S, S))
                 self.surf.blit(wall, (x * S, y * S))
+            elif col == (139, 139, 139):
+                pc = PacDot()
+                pc.x = x * S
+                pc.y = y * S
+                entities.append(pc)
         Sprite(self, self.surf, 0)
 
 
 class MovingEntity(Entity):
     def __init__(self, surf):
         super().__init__()
-        sprite = Sprite(self, surf, 1)
+        sprite = Sprite(self, surf, 2)
         self.phys = CollideRect(
             self,
             Rect(self.x, self.y, sprite.width, sprite.width),
@@ -81,8 +105,10 @@ class Lvl0(Scene):
         pacman.phys.rect.w = S//T
         pacman.phys.rect.h = S//T
 
-        self.entities.append(pacman)
         self.entities.append(Level('lvl0.png'))
+        for entity in entities:
+            self.entities.append(entity)
+        self.entities.append(pacman)
 
         super().load()