diff --git a/csharp/GildedRose.cs b/csharp/GildedRose.cs
index 9458a37d..9812fb75 100644
--- a/csharp/GildedRose.cs
+++ b/csharp/GildedRose.cs
@@ -13,6 +13,8 @@ namespace csharp
         {
             foreach (var item in _items)
             {
+                var qualityDegradationMultiplier = item.Name == "Conjured Mana Cake" ? 2 : 1;
+
                 if (item.Name != "Aged Brie"
                     && item.Name != "Backstage passes to a TAFKAL80ETC concert")
                 {
@@ -20,7 +22,7 @@ namespace csharp
                     {
                         if (item.Name != "Sulfuras, Hand of Ragnaros")
                         {
-                            item.Quality = item.Quality - 1;
+                            item.Quality = item.Quality - qualityDegradationMultiplier;
                         }
                     }
                 }
@@ -72,7 +74,7 @@ namespace csharp
 
                         if (item.Name != "Sulfuras, Hand of Ragnaros")
                         {
-                            item.Quality = item.Quality - 1;
+                            item.Quality = item.Quality - qualityDegradationMultiplier;
                         }
                     }
                     else
diff --git a/csharp/GildedRoseTest.cs b/csharp/GildedRoseTest.cs
index d8ddd99c..ae51bfcd 100644
--- a/csharp/GildedRoseTest.cs
+++ b/csharp/GildedRoseTest.cs
@@ -221,5 +221,41 @@ namespace csharp
 
             Assert.That(item.Quality, Is.EqualTo(0));
         }
+
+        [Test]
+        public void UpdateQuality_ConjuredItemWithSellIn4_DecreasesQualityBy2()
+        {
+            var item = new Item
+            {
+                Name = "Conjured Mana Cake",
+                Quality = 35,
+                SellIn = 4
+            };
+
+            var items = new List<Item>(new[] { item });
+            var gRose = new GildedRose(items);
+
+            gRose.UpdateQuality();
+
+            Assert.That(item.Quality, Is.EqualTo(33));
+        }
+
+        [Test]
+        public void UpdateQuality_ConjuredItemWithSellIn0_DecreasesQualityBy4()
+        {
+            var item = new Item
+            {
+                Name = "Conjured Mana Cake",
+                Quality = 35,
+                SellIn = 0
+            };
+
+            var items = new List<Item>(new[] { item });
+            var gRose = new GildedRose(items);
+
+            gRose.UpdateQuality();
+
+            Assert.That(item.Quality, Is.EqualTo(31));
+        }
     }
 }