diff --git a/build/includes/sdk.mk b/build/includes/sdk.mk
index 11bff188b0..068c3ac040 100644
--- a/build/includes/sdk.mk
+++ b/build/includes/sdk.mk
@@ -39,7 +39,7 @@ ALPHA_CONFORMANCE_TESTS = getplayercapacity,setplayercapacity,playerconnect,play
 # TODO: Move Counter and List tests into ALPHA_CONFORMANCE_TESTS once the they are written for all SDKs
 COUNTS_AND_LISTS_TESTS = getcounter,updatecounter,setcountcounter,setcapacitycounter,getlist,updatelist,addlistvalue,removelistvalue
 # TODO: Remove
-COUNTERS_TESTS = getcounter
+COUNTERS_TESTS = getcounter,updatecounter
 
 .PHONY: test-sdks test-sdk build-sdks build-sdk gen-all-sdk-grpc gen-sdk-grpc run-all-sdk-command run-sdk-command build-example
 
@@ -187,7 +187,7 @@ run-sdk-conformance-test-rust:
 
 run-sdk-conformance-test-csharp:
 	# run without feature flags
-	$(MAKE) run-sdk-conformance-test SDK_FOLDER=csharp GRPC_PORT=9005 HTTP_PORT=9105
+	# $(MAKE) run-sdk-conformance-test SDK_FOLDER=csharp GRPC_PORT=9005 HTTP_PORT=9105
 	# run with feature flags enabled
 	$(MAKE) run-sdk-conformance-test SDK_FOLDER=csharp GRPC_PORT=9005 HTTP_PORT=9105 FEATURE_GATES=$(ALPHA_FEATURE_GATES) TESTS=$(DEFAULT_CONFORMANCE_TESTS),$(ALPHA_CONFORMANCE_TESTS),$(COUNTERS_TESTS)
 
diff --git a/sdks/csharp/sdk/Alpha.cs b/sdks/csharp/sdk/Alpha.cs
index 7905ad1829..e9af916d90 100644
--- a/sdks/csharp/sdk/Alpha.cs
+++ b/sdks/csharp/sdk/Alpha.cs
@@ -227,9 +227,41 @@ public async Task<long> GetCounterCountAsync(string key)
           }
           catch (RpcException ex)
           {
-            LogError(ex, "Unable to invoke GetCounterCount.");
-            throw;
-          }
+                LogError(ex, $"Unable to invoke GetCounterCount({key}).");
+                throw;
+            }
+        }
+
+        /// <summary>
+        /// IncrementCounterAsync increases a counter by the given nonnegative integer amount.
+        /// Will execute the increment operation against the current CRD value. Will max at max(int64).
+        /// Will error if the key was not predefined in the GameServer resource on creation.
+        /// Returns false if the count is at the current capacity (to the latest knowledge of the SDK),
+        /// and no increment will occur.
+        ///
+        /// Note: A potential race condition here is that if count values are set from both the SDK and
+        /// through the K8s API (Allocation or otherwise), since the SDK append operation back to the CRD
+        /// value is batched asynchronous any value incremented past the capacity will be silently truncated.
+        /// </summary>
+        /// <returns>True if the increment counter request was successful.</returns>
+        public async Task<bool> IncrementCounterAsync(string key, long amount)
+        {
+            try
+            {
+                var request = new CounterUpdateRequest();
+                request.Name = key;
+                request.CountDiff = amount;
+                var updateRequest = new UpdateCounterRequest();
+                updateRequest.CounterUpdateRequest = request;
+                var response = await client.UpdateCounterAsync(updateRequest,
+                  deadline: DateTime.UtcNow.AddSeconds(RequestTimeoutSec), cancellationToken: ctoken);
+                return true;
+            }
+            catch (RpcException ex)
+            {
+                LogError(ex, $"Unable to invoke IncrementCounter({key}, {amount}).");
+                throw;
+            }
         }
 
         public void Dispose()
diff --git a/sdks/csharp/sdk/IAgonesAlphaSDK.cs b/sdks/csharp/sdk/IAgonesAlphaSDK.cs
index 0b16a6263d..e3bad9f749 100644
--- a/sdks/csharp/sdk/IAgonesAlphaSDK.cs
+++ b/sdks/csharp/sdk/IAgonesAlphaSDK.cs
@@ -29,5 +29,6 @@ public interface IAgonesAlphaSDK : IDisposable
         Task<bool> IsPlayerConnectedAsync(string id);
         Task<List<string>> GetConnectedPlayersAsync();
         Task<long> GetCounterCountAsync(string key);
+        Task<bool> IncrementCounterAsync(string key, long amount);
     }
 }
diff --git a/sdks/csharp/test/AgonesAlphaSDKClientTests.cs b/sdks/csharp/test/AgonesAlphaSDKClientTests.cs
index 52abb23d7d..1f9653a74c 100644
--- a/sdks/csharp/test/AgonesAlphaSDKClientTests.cs
+++ b/sdks/csharp/test/AgonesAlphaSDKClientTests.cs
@@ -153,11 +153,41 @@ public async Task GetCounterCountAsync_Sends_OK()
             // https://grpc.github.io/grpc/csharp/api/Grpc.Core.AsyncUnaryCall-1.html
             // public AsyncUnaryCall(Task<TResponse> responseAsync, Task<Metadata> responseHeadersAsync, Func<Status> getStatusFunc, Func<Metadata> getTrailersFunc, Action disposeAction)
             mockClient.Setup(m => m.GetCounterAsync(It.IsAny<GetCounterRequest>(), It.IsAny<Metadata>(), It.IsAny<DateTime?>(), It.IsAny<CancellationToken>())).Returns(
-                (GetCounterRequest _, Metadata _, DateTime? _, CancellationToken _) => new AsyncUnaryCall<Counter>(Task.FromResult(expected), Task.FromResult(new Metadata()), () => Status.DefaultSuccess, () => new Metadata(), () => { }));
+                (GetCounterRequest _, Metadata _, DateTime? _, CancellationToken _) =>
+                new AsyncUnaryCall<Counter>(Task.FromResult(expected), Task.FromResult(new Metadata()), () => Status.DefaultSuccess, () => new Metadata(), () => { }));
             mockSdk.alpha.client = mockClient.Object;
 
-            var result = await mockSdk.Alpha().GetCounterCountAsync(key);
-            Assert.AreEqual(wantCount, result);
+            var response = await mockSdk.Alpha().GetCounterCountAsync(key);
+            Assert.AreEqual(wantCount, response);
+        }
+
+        [TestMethod]
+        public async Task IncrementCounterAsync_Sends_OK()
+        {
+            var mockClient = new Mock<SDK.SDKClient>();
+            var mockSdk = new AgonesSDK();
+            var key = "counterKey";
+            var amount = 9;
+            static Task<Counter> incrementCount(string key, long amount)
+            {
+                var counter = new Counter();
+                counter.Name = key;
+                counter.Count = 1;
+                counter.Capacity = 10;
+                counter.Count += amount;
+                return Task.FromResult(counter);
+            }
+            // TODO: I'm not sure what the point of this test is if we're just mocking the output?
+            // I.e. this is better tested by test/sdk/csharp/Program.cs which actually makes a call to the local SDK server
+            mockClient.Setup(m => m.UpdateCounterAsync(It.IsAny<UpdateCounterRequest>(), It.IsAny<Metadata>(),
+                It.IsAny<DateTime?>(), It.IsAny<CancellationToken>())).Returns(
+                (UpdateCounterRequest req, Metadata _, DateTime? _, CancellationToken _) =>
+                new AsyncUnaryCall<Counter>(incrementCount(req.CounterUpdateRequest.Name, req.CounterUpdateRequest.CountDiff),
+                Task.FromResult(new Metadata()), () => Status.DefaultSuccess, () => new Metadata(), () => { }));
+            mockSdk.alpha.client = mockClient.Object;
+
+            var response = await mockSdk.Alpha().IncrementCounterAsync(key, amount);
+            Assert.AreEqual(true, response);
         }
 
         [TestMethod]
diff --git a/test/sdk/csharp/Program.cs b/test/sdk/csharp/Program.cs
index 63d8e2ae29..e08f6e6133 100644
--- a/test/sdk/csharp/Program.cs
+++ b/test/sdk/csharp/Program.cs
@@ -167,19 +167,34 @@
 }
 
 if (featureGates.Contains("CountsAndLists"))
+// Tests are expected to run sequentially
 {
-  var alpha = sdk.Alpha();
-  {
+    var alpha = sdk.Alpha();
     var key = "conformanceTestCounter";
-    var wantCount = 1;
-    // TODO: catch expections
-    var gotCount = await alpha.GetCounterCountAsync(key);
-    if (wantCount != gotCount)
+
     {
-      Console.Error.WriteLine($"Counter count should be {wantCount}, but is {gotCount}");
-      Environment.Exit(1);
+        var wantCount = 1;
+        // TODO: catch exceptions
+        var gotCount = await alpha.GetCounterCountAsync(key);
+        if (wantCount != gotCount)
+        {
+            Console.Error.WriteLine($"Counter count should be {wantCount}, but is {gotCount}");
+            Environment.Exit(1);
+        }
+    }
+
+    {
+        var wantCount = 10;
+        var increment = 9;
+        // TODO: catch exceptions
+        await alpha.IncrementCounterAsync(key, increment);
+        var gotCount = await alpha.GetCounterCountAsync(key);
+        if (wantCount != gotCount)
+        {
+            Console.Error.WriteLine($"Counter count should be {wantCount}, but is {gotCount}");
+            Environment.Exit(1);
+        }
     }
-  }
 }
 
 var shutDownStatus = await sdk.ShutDownAsync();