diff --git a/src/main/java/inf112/fiasko/roborally/element_properties/Position.java b/src/main/java/inf112/fiasko/roborally/element_properties/Position.java
index aab5f6e..b81f758 100644
--- a/src/main/java/inf112/fiasko/roborally/element_properties/Position.java
+++ b/src/main/java/inf112/fiasko/roborally/element_properties/Position.java
@@ -5,8 +5,8 @@ package inf112.fiasko.roborally.element_properties;
  */
 public class Position {
 
-    private int xCoordinate;
-    private int yCoordinate;
+    private final int xCoordinate;
+    private final int yCoordinate;
 
     /**
      * Initializes the position
diff --git a/src/main/java/inf112/fiasko/roborally/objects/DrawableObject.java b/src/main/java/inf112/fiasko/roborally/objects/DrawableObject.java
index bbedf7d..062e62f 100644
--- a/src/main/java/inf112/fiasko/roborally/objects/DrawableObject.java
+++ b/src/main/java/inf112/fiasko/roborally/objects/DrawableObject.java
@@ -7,8 +7,8 @@ import inf112.fiasko.roborally.element_properties.GameTexture;
  */
 public class DrawableObject implements IDrawableObject {
     private final GameTexture texture;
-    private int xPos;
-    private int yPos;
+    private final int xPos;
+    private final int yPos;
     private int width = 64;
     private int height = 64;
     private int rotation = 0;
diff --git a/src/main/java/inf112/fiasko/roborally/objects/Robot.java b/src/main/java/inf112/fiasko/roborally/objects/Robot.java
index 4e0ae97..fb08c8f 100644
--- a/src/main/java/inf112/fiasko/roborally/objects/Robot.java
+++ b/src/main/java/inf112/fiasko/roborally/objects/Robot.java
@@ -7,7 +7,7 @@ import inf112.fiasko.roborally.element_properties.Position;
  */
 public class Robot {
     private int robotDamageTaken = 0;
-    private int playerId; //might not be needed
+    private final int playerId; //might not be needed
     private boolean inPowerDown = false;
     private int lastFlagVisited = 0;
     private Position backupPosition;
diff --git a/src/main/java/inf112/fiasko/roborally/objects/Wall.java b/src/main/java/inf112/fiasko/roborally/objects/Wall.java
index 2057ec8..8f4c941 100644
--- a/src/main/java/inf112/fiasko/roborally/objects/Wall.java
+++ b/src/main/java/inf112/fiasko/roborally/objects/Wall.java
@@ -8,8 +8,8 @@ import inf112.fiasko.roborally.element_properties.WallType;
  */
 public class Wall {
 
-    private WallType wallType;
-    private Direction direction;
+    private final WallType wallType;
+    private final Direction direction;
 
     /**
      * Initializes a wall