diff --git a/commander/src/main/java/com/iluwatar/commander/Commander.java b/commander/src/main/java/com/iluwatar/commander/Commander.java
index 5505e5686fc5..6b6c90a03f8d 100644
--- a/commander/src/main/java/com/iluwatar/commander/Commander.java
+++ b/commander/src/main/java/com/iluwatar/commander/Commander.java
@@ -477,8 +477,8 @@ private void handlePaymentPossibleErrorMsgErrorIssue(Order order, Order o) {
         && System.currentTimeMillis() - o.createdTime < messageTime) {
       var qt = new QueueTask(order, TaskType.MESSAGING, 1);
       updateQueue(qt);
-      LOG.warn("Order " + order.id + ": Error in sending Payment Error message, "
-              + "trying to queue task and add to employee handle..");
+      LOG.warn("Order {}: Error in sending Payment Error message, trying to queue task and add to employee handle..",
+              order.id);
       employeeHandleIssue(o);
     }
   }
diff --git a/extension-objects/src/main/java/App.java b/extension-objects/src/main/java/App.java
index 8efb6051198a..dd67b2e1e4b1 100644
--- a/extension-objects/src/main/java/App.java
+++ b/extension-objects/src/main/java/App.java
@@ -62,7 +62,7 @@ private static void checkExtensionsForUnit(Unit unit) {
     final var logger = LoggerFactory.getLogger(App.class);
 
     var name = unit.getName();
-    Function<String, Runnable> func = (e) -> () -> logger.info(name + " without " + e);
+    Function<String, Runnable> func = e -> () -> logger.info("{} without {}", name, e);
 
     var extension = "SoldierExtension";
     Optional.ofNullable(unit.getUnitExtension(extension))
diff --git a/game-loop/src/main/java/com/iluwatar/gameloop/GameLoop.java b/game-loop/src/main/java/com/iluwatar/gameloop/GameLoop.java
index 81d541c9d1e0..6ad8c2c52c8b 100644
--- a/game-loop/src/main/java/com/iluwatar/gameloop/GameLoop.java
+++ b/game-loop/src/main/java/com/iluwatar/gameloop/GameLoop.java
@@ -39,12 +39,10 @@ public abstract class GameLoop {
 
   protected final GameController controller;
 
-  private Thread gameThread;
-
   /**
    * Initialize game status to be stopped.
    */
-  public GameLoop() {
+  protected GameLoop() {
     controller = new GameController();
     status = GameStatus.STOPPED;
   }
@@ -54,7 +52,7 @@ public GameLoop() {
    */
   public void run() {
     status = GameStatus.RUNNING;
-    gameThread = new Thread(this::processGameLoop);
+    Thread gameThread = new Thread(this::processGameLoop);
     gameThread.start();
   }
 
@@ -85,6 +83,8 @@ protected void processInput() {
       Thread.sleep(lag);
     } catch (InterruptedException e) {
       logger.error(e.getMessage());
+      /* Clean up whatever needs to be handled before interrupting  */
+      Thread.currentThread().interrupt();
     }
   }
 
@@ -94,7 +94,7 @@ protected void processInput() {
    */
   protected void render() {
     var position = controller.getBulletPosition();
-    logger.info("Current bullet position: " + position);
+    logger.info("Current bullet position: {}", position);
   }
 
   /**
diff --git a/special-case/src/main/java/com/iluwatar/specialcase/InvalidUser.java b/special-case/src/main/java/com/iluwatar/specialcase/InvalidUser.java
index 681b9077c52d..861d69e8c98d 100644
--- a/special-case/src/main/java/com/iluwatar/specialcase/InvalidUser.java
+++ b/special-case/src/main/java/com/iluwatar/specialcase/InvalidUser.java
@@ -42,6 +42,6 @@ public InvalidUser(String userName) {
 
   @Override
   public void show() {
-    LOGGER.info("Invalid user: " + userName);
+    LOGGER.info(String.format("Invalid user: %s", userName));
   }
 }
diff --git a/special-case/src/main/java/com/iluwatar/specialcase/MaintenanceLock.java b/special-case/src/main/java/com/iluwatar/specialcase/MaintenanceLock.java
index 3abef8b13aea..341dbee85686 100644
--- a/special-case/src/main/java/com/iluwatar/specialcase/MaintenanceLock.java
+++ b/special-case/src/main/java/com/iluwatar/specialcase/MaintenanceLock.java
@@ -55,6 +55,6 @@ public boolean isLock() {
 
   public void setLock(boolean lock) {
     this.lock = lock;
-    LOGGER.info("Maintenance lock is set to: ", lock);
+    LOGGER.info("Maintenance lock is set to: {}", lock);
   }
 }
diff --git a/special-case/src/main/java/com/iluwatar/specialcase/OutOfStock.java b/special-case/src/main/java/com/iluwatar/specialcase/OutOfStock.java
index 9a04a63f56e7..5bfa09186d2d 100644
--- a/special-case/src/main/java/com/iluwatar/specialcase/OutOfStock.java
+++ b/special-case/src/main/java/com/iluwatar/specialcase/OutOfStock.java
@@ -34,8 +34,8 @@ public class OutOfStock implements ReceiptViewModel {
 
   private static final Logger LOGGER = LoggerFactory.getLogger(OutOfStock.class);
 
-  private String userName;
-  private String itemName;
+  private final String userName;
+  private final String itemName;
 
   public OutOfStock(String userName, String itemName) {
     this.userName = userName;
@@ -44,6 +44,6 @@ public OutOfStock(String userName, String itemName) {
 
   @Override
   public void show() {
-    LOGGER.info("Out of stock: " + itemName + " for user = " + userName + " to buy");
+    LOGGER.info(String.format("Out of stock: %s for user = %s to buy", itemName, userName));
   }
 }
diff --git a/special-case/src/main/java/com/iluwatar/specialcase/ReceiptDto.java b/special-case/src/main/java/com/iluwatar/specialcase/ReceiptDto.java
index b3e9db30396d..c619ee87d061 100644
--- a/special-case/src/main/java/com/iluwatar/specialcase/ReceiptDto.java
+++ b/special-case/src/main/java/com/iluwatar/specialcase/ReceiptDto.java
@@ -34,7 +34,7 @@ public class ReceiptDto implements ReceiptViewModel {
 
   private static final Logger LOGGER = LoggerFactory.getLogger(ReceiptDto.class);
 
-  private Double price;
+  private final Double price;
 
   public ReceiptDto(Double price) {
     this.price = price;
@@ -46,6 +46,6 @@ public Double getPrice() {
 
   @Override
   public void show() {
-    LOGGER.info("Receipt: " + price + " paid");
+    LOGGER.info(String.format("Receipt: %s paid", price));
   }
 }
diff --git a/subclass-sandbox/src/main/java/com/iluwatar/subclasssandbox/Superpower.java b/subclass-sandbox/src/main/java/com/iluwatar/subclasssandbox/Superpower.java
index 4e520f39754e..3c4f42aba53e 100644
--- a/subclass-sandbox/src/main/java/com/iluwatar/subclasssandbox/Superpower.java
+++ b/subclass-sandbox/src/main/java/com/iluwatar/subclasssandbox/Superpower.java
@@ -47,7 +47,7 @@ public abstract class Superpower {
    * @param z Z coordinate.
    */
   protected void move(double x, double y, double z) {
-    logger.info("Move to ( " + x + ", " + y + ", " + z + " )");
+    logger.info("Move to ( {}, {}, {} )", x, y, z);
   }
 
   /**
@@ -56,7 +56,7 @@ protected void move(double x, double y, double z) {
    * @param volume Value of volume.
    */
   protected void playSound(String soundName, int volume) {
-    logger.info("Play " + soundName + " with volume " + volume);
+    logger.info("Play {} with volume {}", soundName, volume);
   }
 
   /**
@@ -65,6 +65,6 @@ protected void playSound(String soundName, int volume) {
    * @param count Count of particles to be spawned.
    */
   protected void spawnParticles(String particleType, int count) {
-    logger.info("Spawn " + count + " particle with type " + particleType);
+    logger.info("Spawn {} particle with type {}", count, particleType);
   }
 }
diff --git a/update-method/src/main/java/com/iluwatar/updatemethod/Statue.java b/update-method/src/main/java/com/iluwatar/updatemethod/Statue.java
index 7126727d45b4..7212a7a1b6d3 100644
--- a/update-method/src/main/java/com/iluwatar/updatemethod/Statue.java
+++ b/update-method/src/main/java/com/iluwatar/updatemethod/Statue.java
@@ -65,6 +65,6 @@ public void update() {
   }
 
   private void shootLightning() {
-    logger.info("Statue " + id + " shoots lightning!");
+    logger.info("Statue {} shoots lightning!", id);
   }
 }