diff --git a/docs/get-started/local-testing-with-mock-gpu.md b/docs/get-started/local-testing-with-mock-gpu.md
new file mode 100644
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+++ b/docs/get-started/local-testing-with-mock-gpu.md
@@ -0,0 +1,214 @@
+---
+title: Local Zero-Hardware HAMi Sandbox & Mock GPU Testing
+sidebar_label: Local Mock GPU Testing
+---
+
+This guide demonstrates how to set up a local, zero-hardware HAMi testing sandbox on a CPU-only machine using [Kind](https://kind.sigs.k8s.io/) (or Minikube) and HAMi's built-in **`mockDevicePlugin`**.
+
+This enables developers, evaluators, and contributors to test `hami-scheduler` resource allocation logic, verify `nvidia.com/gpumem` and `nvidia.com/gpucores` extended resource advertising, inspect mutating webhook annotations, and debug scheduling failure modes without requiring physical NVIDIA GPUs or host-installed CUDA drivers.
+
+:::note MOCK VALIDATION SCOPE
+
+- **MOCK VALIDATED**: Kubernetes extended resource registration (`nvidia.com/gpumem`, `nvidia.com/gpucores`), `hami-scheduler` extender allocation, mutating webhook pod annotations (`hami.io/bind-gpu-idx`), and scheduler oversubscription pending diagnostics.
+- **REAL GPU VALIDATION REQUIRED**: Hardware-level CUDA symbol interception (`libvgpu.so`), hard GPU memory enforcement, and physical kernel execution.
+
+:::
+
+## Prerequisites
+
+Before starting, ensure your local CPU-only workstation has the following tools installed:
+
+- **Docker**: Engine v20.10+
+- **Kind**: v0.20.0+ (or Minikube)
+- **kubectl**: v1.26+
+- **Helm**: v3.8+
+
+## Step 1: Create a Local CPU-Only Kind Cluster
+
+Create a standard single-node Kubernetes cluster using Kind:
+
+```bash
+kind create cluster --name hami-sandbox
+```
+
+Verify that `kubectl` is connected to your local cluster:
+
+```bash
+kubectl cluster-info --context kind-hami-sandbox
+kubectl get nodes
+```
+
+Expected output:
+
+```text
+NAME                         STATUS   ROLES           AGE   VERSION
+hami-sandbox-control-plane   Ready    control-plane   30s   v1.27.3
+```
+
+## Step 2: Deploy HAMi with Mock Device Plugin
+
+Deploy HAMi using Helm, explicitly enabling `mockDevicePlugin.enabled=true` and disabling the default physical `devicePlugin.enabled=false`.
+
+1. Add the official HAMi Helm repository:
+
+   ```bash
+   helm repo add hami-charts https://project-hami.github.io/HAMi/
+   helm repo update
+   ```
+
+2. Install HAMi in the `kube-system` namespace with mock plugin enabled:
+
+   ```bash
+   helm install hami hami-charts/hami \
+     --namespace kube-system \
+     --set mockDevicePlugin.enabled=true \
+     --set devicePlugin.enabled=false
+   ```
+
+3. Verify that the HAMi components are running:
+
+   ```bash
+   kubectl get pods -n kube-system -l 'app.kubernetes.io/name=hami'
+   ```
+
+Expected output:
+
+```text
+NAME                                       READY   STATUS    RESTARTS   AGE
+hami-scheduler-65b7964448-x8j2l            1/1     Running   0          45s
+hami-vgpu-mock-device-plugin-ds-7k9lm      1/1     Running   0          45s
+```
+
+## Step 3: Verify Node Extended Resource Advertising
+
+The `mockDevicePlugin` registers simulated NVIDIA GPU extended resources to the Kubernetes node allocator.
+
+Inspect the node allocatable capacity:
+
+```bash
+kubectl describe node hami-sandbox-control-plane | grep -A 8 "Allocatable:"
+```
+
+Expected output:
+
+```text
+Allocatable:
+  cpu:                8
+  ephemeral-storage:  100Gi
+  hugepages-2Mi:      0
+  memory:             16300Mi
+  nvidia.com/gpucores: 100
+  nvidia.com/gpumem:   8192
+  nvidia.com/gpumem-percentage: 100
+  pods:               110
+```
+
+Notice that `nvidia.com/gpumem` (8192 MiB) and `nvidia.com/gpucores` (100 core units) are now active allocatable resources on your CPU-only node.
+
+## Step 4: Submit a Fractional vGPU Pod & Verify Scheduling
+
+Submit a test pod requesting a fraction of mock GPU memory and cores:
+
+```yaml
+cat <<EOF | kubectl apply -f -
+apiVersion: v1
+kind: Pod
+metadata:
+  name: mock-gpu-workload
+spec:
+  containers:
+    - name: app
+      image: ubuntu:22.04
+      command: ["bash", "-c", "sleep 3600"]
+      resources:
+        limits:
+          nvidia.com/gpumem: 2048
+          nvidia.com/gpucores: 50
+EOF
+```
+
+Verify that the pod is successfully scheduled (`Running` state):
+
+```bash
+kubectl get pod mock-gpu-workload
+```
+
+Inspect the pod annotations injected by the `hami-scheduler` mutating webhook:
+
+```bash
+kubectl get pod mock-gpu-workload -o yaml | grep -A 10 "annotations:"
+```
+
+Expected output:
+
+```yaml
+  annotations:
+    hami.io/bind-gpu-idx: "0"
+    hami.io/bind-gpumem: "2048"
+    hami.io/bind-gpucores: "50"
+```
+
+This confirms that `hami-scheduler` successfully evaluated the extended resource requests, bound the pod to mock GPU index `0`, and recorded the fractional allocation.
+
+## Step 5: Test Oversubscription & Scheduler Diagnostics
+
+To observe how HAMi handles resource exhaustion without physical hardware, submit a second pod requesting more GPU memory than remains available on the node (e.g. requesting `7000` MiB when only `6144` MiB remain allocatable):
+
+```yaml
+cat <<EOF | kubectl apply -f -
+apiVersion: v1
+kind: Pod
+metadata:
+  name: mock-gpu-oversubscribed
+spec:
+  containers:
+    - name: app
+      image: ubuntu:22.04
+      command: ["bash", "-c", "sleep 3600"]
+      resources:
+        limits:
+          nvidia.com/gpumem: 7000
+          nvidia.com/gpucores: 50
+EOF
+```
+
+Check the pod status:
+
+```bash
+kubectl get pod mock-gpu-oversubscribed
+```
+
+Expected output:
+
+```text
+NAME                      READY   STATUS    RESTARTS   AGE
+mock-gpu-oversubscribed   0/1     Pending   0          12s
+```
+
+Diagnose the scheduling failure reason via cluster events:
+
+```bash
+kubectl get events --field-selector reason=FailedScheduling
+```
+
+Expected output:
+
+```text
+LAST SEEN   TYPE      REASON             OBJECT                        MESSAGE
+15s         Warning   FailedScheduling   pod/mock-gpu-oversubscribed   0/1 nodes are available: 1 Insufficient nvidia.com/gpumem. preemption: 0/1 nodes are available: 1 No preemption victims found for incoming pod.
+```
+
+Inspect `hami-scheduler` logs to confirm extender decision logs:
+
+```bash
+kubectl logs -n kube-system -l app.kubernetes.io/component=hami-scheduler --tail=50
+```
+
+## Step 6: Cleanup Local Environment
+
+Delete the test workloads and tear down the Kind sandbox:
+
+```bash
+kubectl delete pod mock-gpu-workload mock-gpu-oversubscribed --ignore-not-found
+kind delete cluster --name hami-sandbox
+```
diff --git a/docs/troubleshooting/troubleshooting.md b/docs/troubleshooting/troubleshooting.md
index ec4851f41..35698e1db 100644
--- a/docs/troubleshooting/troubleshooting.md
+++ b/docs/troubleshooting/troubleshooting.md
@@ -160,3 +160,33 @@ devicePlugin:
 ```
 
 :::
+
+## Local Zero-Hardware Sandbox & Scheduler Diagnostics {#local-zero-hardware-sandbox}
+
+If physical NVIDIA hardware or host drivers are unavailable, HAMi provides a built-in **`mockDevicePlugin`** mode for local cluster evaluation (on Kind or Minikube).
+
+When testing scheduler extender behavior or debugging `Pending` pod states without physical GPUs:
+
+1. Enable the mock plugin in Helm:
+
+   ```bash
+   helm upgrade hami hami-charts/hami -n kube-system \
+     --reuse-values \
+     --set mockDevicePlugin.enabled=true \
+     --set devicePlugin.enabled=false
+   ```
+
+2. Verify allocatable mock capacity (`nvidia.com/gpumem` and `nvidia.com/gpucores`):
+
+   ```bash
+   kubectl describe node <node-name> | grep -A 5 "Allocatable:"
+   ```
+
+3. Check scheduling failure reasons for `Pending` pods:
+
+   ```bash
+   kubectl get events --field-selector reason=FailedScheduling
+   kubectl logs -n kube-system -l app.kubernetes.io/component=hami-scheduler
+   ```
+
+For a complete step-by-step tutorial, see the [Local Mock GPU Testing Guide](../get-started/local-testing-with-mock-gpu.md).
diff --git a/sidebars.js b/sidebars.js
index 3487c0e9f..be5df3252 100644
--- a/sidebars.js
+++ b/sidebars.js
@@ -37,7 +37,11 @@ module.exports = {
         title: "Get Started",
         description: "Install and run HAMi quickly with a guided first deployment path.",
       },
-      items: ["get-started/deploy-with-helm", "get-started/verify-hami"],
+      items: [
+        "get-started/deploy-with-helm",
+        "get-started/verify-hami",
+        "get-started/local-testing-with-mock-gpu",
+      ],
     },
     {
       type: "category",
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