diff --git a/src/main/java/core/Master.java b/src/main/java/core/Master.java
index 9210a39..0b765c8 100644
--- a/src/main/java/core/Master.java
+++ b/src/main/java/core/Master.java
@@ -5,7 +5,7 @@ import core.physics.Collidable;
 import core.physics.Collision;
 import objects.DebugPos;
 import objects.ships.BattleShip;
-import objects.GameObject;
+import objects.core.GameObject;
 import objects.ships.Submarine;
 import objects.world.Grid;
 import objects.world.Wall;
@@ -13,7 +13,6 @@ import objects.world.Wall;
 import javax.swing.*;
 import java.awt.*;
 import java.util.ArrayList;
-import java.util.concurrent.atomic.AtomicBoolean;
 
 /**
  * The main object that controls everything
diff --git a/src/main/java/objects/DebugPos.java b/src/main/java/objects/DebugPos.java
index 20f888f..9775791 100644
--- a/src/main/java/objects/DebugPos.java
+++ b/src/main/java/objects/DebugPos.java
@@ -1,6 +1,7 @@
 package objects;
 
 import core.math.Vector2D;
+import objects.core.GameObject;
 
 import java.awt.*;
 
diff --git a/src/main/java/objects/core/CollGameObject.java b/src/main/java/objects/core/CollGameObject.java
new file mode 100644
index 0000000..38c2c8a
--- /dev/null
+++ b/src/main/java/objects/core/CollGameObject.java
@@ -0,0 +1,56 @@
+package objects.core;
+
+import core.math.Vector2D;
+import core.physics.Collidable;
+import core.physics.hitboxes.Hitbox;
+
+/**
+ * A specialization of GameObject with Collidable properties
+ */
+public abstract class CollGameObject extends GameObject implements Collidable {
+
+    protected Hitbox hitbox;
+
+    public CollGameObject(Vector2D position, Vector2D size, Hitbox hitbox) {
+        super(position, size);
+        this.hitbox = hitbox;
+    }
+
+    public CollGameObject(double x, double y, double xSize, double ySize, Hitbox hitbox) {
+        super(x, y, xSize, ySize);
+        this.hitbox = hitbox;
+    }
+
+    /**
+     * A simple method to move the object to a Vector2D. This method should be called instead of doing it manually.
+     * Does not move if it encounters a collision
+     *
+     * @param target The target position
+     */
+    @Override
+    public void moveTo(Vector2D target) {
+        Vector2D oldPos = position.copy();
+        this.position = target;
+
+        ((Collidable) this).getHitbox().moveTo(position, size);
+        if (master.doesCollide(this) != null) {
+            this.position = oldPos;
+            ((Collidable) this).getHitbox().moveTo(oldPos, size);
+        }
+    }
+
+    @Override
+    public Hitbox getHitbox() {
+        return hitbox;
+    }
+
+    @Override
+    public Vector2D getCenterPos() {
+        return getCenterPosition();
+    }
+
+    @Override
+    public Vector2D getSize() {
+        return size;
+    }
+}
diff --git a/src/main/java/objects/GameObject.java b/src/main/java/objects/core/GameObject.java
similarity index 91%
rename from src/main/java/objects/GameObject.java
rename to src/main/java/objects/core/GameObject.java
index bddab07..3327e03 100644
--- a/src/main/java/objects/GameObject.java
+++ b/src/main/java/objects/core/GameObject.java
@@ -1,4 +1,4 @@
-package objects;
+package objects.core;
 
 import core.math.Coords;
 import core.Drawable;
@@ -53,16 +53,7 @@ public abstract class GameObject implements Drawable {
      * @param target The target position
      */
     public void moveTo(Vector2D target) {
-        Vector2D oldPos = position.copy();
         this.position = target;
-
-        if (this instanceof Collidable) {
-            ((Collidable) this).getHitbox().moveTo(position, size);
-            if (master.doesCollide((Collidable) this) != null) {
-                this.position = oldPos;
-                ((Collidable) this).getHitbox().moveTo(oldPos, size);
-            }
-        }
     }
 
     /**
diff --git a/src/main/java/objects/ships/BattleShip.java b/src/main/java/objects/ships/BattleShip.java
index 1356515..4799aeb 100644
--- a/src/main/java/objects/ships/BattleShip.java
+++ b/src/main/java/objects/ships/BattleShip.java
@@ -1,6 +1,6 @@
 package objects.ships;
 
-import objects.GameObject;
+import objects.core.GameObject;
 
 import java.awt.*;
 import java.util.ArrayList;
diff --git a/src/main/java/objects/ships/Shell.java b/src/main/java/objects/ships/Shell.java
index 14f466d..cf2ded7 100644
--- a/src/main/java/objects/ships/Shell.java
+++ b/src/main/java/objects/ships/Shell.java
@@ -1,15 +1,20 @@
 package objects.ships;
 
 import core.math.Vector2D;
-import objects.GameObject;
+import core.physics.hitboxes.RectHitBox;
+import objects.core.CollGameObject;
 
 import java.awt.*;
 
-public class Shell extends GameObject {
+/**
+ * A shell fired by a cannon
+ */
+//TODO why tf do shells not use map coords...
+public class Shell extends CollGameObject {
 
 
     public Shell(Vector2D position, Vector2D size, Vector2D velocity) {
-        super(position, size);
+        super(position, size, new RectHitBox(position, size));
         this.velocity = velocity;
     }
 
@@ -21,6 +26,6 @@ public class Shell extends GameObject {
 
     @Override
     public void update() {
-        position.add(velocity);
+        moveTo(Vector2D.add(position, velocity));
     }
 }
diff --git a/src/main/java/objects/ships/Submarine.java b/src/main/java/objects/ships/Submarine.java
index 1bd26ff..2204269 100644
--- a/src/main/java/objects/ships/Submarine.java
+++ b/src/main/java/objects/ships/Submarine.java
@@ -2,20 +2,15 @@ package objects.ships;
 
 import core.math.Coords;
 import core.math.Vector2D;
-import core.physics.Collidable;
-import core.physics.hitboxes.Hitbox;
 import core.physics.hitboxes.RectHitBox;
-import objects.GameObject;
+import objects.core.CollGameObject;
 
 import java.awt.*;
 
-public class Submarine extends GameObject implements Collidable {
-
-    private final RectHitBox hitbox;
+public class Submarine extends CollGameObject {
 
     public Submarine(Vector2D position, Vector2D size) {
-        super(position, size);
-        this.hitbox = new RectHitBox(position, size);
+        super(position, size, new RectHitBox(position, size));
         this.mainColor = Color.BLUE;
     }
 
@@ -33,18 +28,4 @@ public class Submarine extends GameObject implements Collidable {
         moveTo(centerRelPos);
     }
 
-    @Override
-    public Hitbox getHitbox() {
-        return hitbox;
-    }
-
-    @Override
-    public Vector2D getCenterPos() {
-        return getCenterPosition();
-    }
-
-    @Override
-    public Vector2D getSize() {
-        return size;
-    }
 }
diff --git a/src/main/java/objects/ships/Turret.java b/src/main/java/objects/ships/Turret.java
index ea5ff2c..ed1cbd6 100644
--- a/src/main/java/objects/ships/Turret.java
+++ b/src/main/java/objects/ships/Turret.java
@@ -2,7 +2,7 @@ package objects.ships;
 
 import core.math.ExMath;
 import core.math.Vector2D;
-import objects.GameObject;
+import objects.core.GameObject;
 
 import java.awt.*;
 
diff --git a/src/main/java/objects/world/Grid.java b/src/main/java/objects/world/Grid.java
index 8d68f32..f056735 100644
--- a/src/main/java/objects/world/Grid.java
+++ b/src/main/java/objects/world/Grid.java
@@ -1,7 +1,6 @@
 package objects.world;
 
-import core.Master;
-import objects.GameObject;
+import objects.core.GameObject;
 
 import java.awt.*;
 
diff --git a/src/main/java/objects/world/Wall.java b/src/main/java/objects/world/Wall.java
index 77162ad..6bcd8e7 100644
--- a/src/main/java/objects/world/Wall.java
+++ b/src/main/java/objects/world/Wall.java
@@ -1,20 +1,16 @@
 package objects.world;
 
 import core.math.Vector2D;
-import core.physics.Collidable;
 import core.physics.hitboxes.Hitbox;
 import core.physics.hitboxes.RectHitBox;
-import objects.GameObject;
+import objects.core.CollGameObject;
 
 import java.awt.*;
 
-public class Wall extends GameObject implements Collidable {
-
-    private final RectHitBox hitbox;
+public class Wall extends CollGameObject {
 
     public Wall(double x, double y, double xSize, double ySize) {
-        super(x, y, xSize, ySize);
-        this.hitbox = new RectHitBox(new Vector2D(x, y), new Vector2D(xSize, ySize));
+        super(x, y, xSize, ySize, new RectHitBox(new Vector2D(x, y), new Vector2D(xSize, ySize)));
     }
 
     @Override
diff --git a/target/classes/core/Master.class b/target/classes/core/Master.class
index b8ddd11..420b9fb 100644
Binary files a/target/classes/core/Master.class and b/target/classes/core/Master.class differ
diff --git a/target/classes/objects/GameObject.class b/target/classes/objects/GameObject.class
deleted file mode 100644
index ef7541f..0000000
Binary files a/target/classes/objects/GameObject.class and /dev/null differ