diff --git a/TypeScript/app/gilded-rose.ts b/TypeScript/app/gilded-rose.ts
index ea8adf4b..b08314d1 100644
--- a/TypeScript/app/gilded-rose.ts
+++ b/TypeScript/app/gilded-rose.ts
@@ -9,12 +9,14 @@ export class GildedRose {
   }
 
   handleSellIn(item) {
+    //
     if (item.name != ITEMS.SURFRAS) {
       item.sellIn -= 1;
     }
     if (item.sellIn >= 0) return;
     if (item.quality >= 50) return;
 
+    //
     switch (item.name) {
       case ITEMS.BRIE:
         item.quality = item.quality + 1;
@@ -29,6 +31,7 @@ export class GildedRose {
   }
 
   handlePassesQuality(item) {
+    //
     if (item.name !== ITEMS.PASSES) return;
     if (6 <= item.sellIn && item.sellIn < 11) {
       item.quality += 1;
@@ -40,6 +43,7 @@ export class GildedRose {
   }
 
   handleQuality(item) {
+    //
     switch (item.name) {
       case ITEMS.PASSES:
         this.handlePassesQuality(item);
diff --git a/TypeScript/app/itemClasses.ts b/TypeScript/app/itemClasses.ts
index 7507b2b5..0bbc09fb 100644
--- a/TypeScript/app/itemClasses.ts
+++ b/TypeScript/app/itemClasses.ts
@@ -23,11 +23,12 @@ export class AgedBrie extends Item {
     super("Aged Brie", sellIn, quality);
   }
   handleQuality() {
-    //
+    this.quality++;
+    this.quality++;
   }
 
   handleSellIn() {
-    //
+    this.sellIn--;
   }
 }
 
@@ -37,11 +38,20 @@ export class Passes extends Item {
   }
 
   handleQuality() {
-    //
+    this.quality--;
+
+    if (6 <= this.sellIn && this.sellIn < 11) {
+      this.quality += 1;
+    }
+
+    if (this.sellIn < 6) {
+      this.quality += 2;
+    }
+    this.quality++;
   }
 
   handleSellIn() {
-    //
+    this.sellIn--;
   }
 }
 
@@ -50,7 +60,9 @@ export class Surfras extends Item {
     super("Sulfuras, Hand of Ragnaros", sellIn, quality);
   }
   handleQuality() {
-    //
+    this.quality = 0;
+    this.quality--;
+    this.quality++;
   }
 
   handleSellIn() {