diff --git a/BlazorApp/WebAPI/Controllers/RankingController.cs b/BlazorApp/WebAPI/Controllers/RankingController.cs
index 86e7752..24452c7 100644
--- a/BlazorApp/WebAPI/Controllers/RankingController.cs
+++ b/BlazorApp/WebAPI/Controllers/RankingController.cs
@@ -18,6 +18,14 @@ namespace WebAPI.Controllers
 
         // Create
         // POST
+        [HttpPost]
+        public GameResult AddGameResult([FromBody]GameResult gameResult)
+        {
+            _context.GameResults.Add(gameResult);
+            _context.SaveChanges();
+
+            return gameResult;
+        }
 
         // Read
         // GET
@@ -34,7 +42,7 @@ namespace WebAPI.Controllers
         [HttpGet("{id}")]
         public GameResult GetGameResults(int id)
         {
-            GameResult result = _context.GameResults
+            GameResult? result = _context.GameResults
                 .Where(x => x.Id == id)
                 .FirstOrDefault();
 
@@ -43,8 +51,40 @@ namespace WebAPI.Controllers
 
         // Update
         // PUT
+        [HttpPut]
+        public bool UpdateGameResult([FromBody]GameResult gameResult)
+        {
+            var findResult = _context.GameResults
+                .Where(x => x.Id == gameResult.Id)
+                .FirstOrDefault();
+
+            if (findResult == null)
+                return false;
+
+            findResult.UserName = gameResult.UserName;
+            findResult.Score = gameResult.Score;
+            findResult.Date = DateTime.Now;
+            _context.SaveChanges();
+
+            return true;
+        }
 
         // Delete
         // DELETE
+        [HttpDelete("{id}")]
+        public bool DeleteGameResults(int id)
+        {
+            var findResult = _context.GameResults
+                .Where(x => x.Id == id)
+                .FirstOrDefault();
+
+            if (findResult == null)
+                return false;
+
+            _context.GameResults.Remove(findResult);
+            _context.SaveChanges();
+
+            return true;
+        }
     }
 }