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diff --git a/ui/src/components/InstancesView.svelte b/ui/src/components/InstancesView.svelte
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+++ b/ui/src/components/InstancesView.svelte
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+<script lang="ts">
+  import { onMount } from "svelte";
+  import { instancesState } from "../stores/instances.svelte";
+  import { Plus, Trash2, Edit2, Copy, Check, X } from "lucide-svelte";
+  import type { Instance } from "../types";
+
+  let showCreateModal = $state(false);
+  let showEditModal = $state(false);
+  let showDeleteConfirm = $state(false);
+  let showDuplicateModal = $state(false);
+  let selectedInstance: Instance | null = $state(null);
+  let newInstanceName = $state("");
+  let duplicateName = $state("");
+
+  onMount(() => {
+    instancesState.loadInstances();
+  });
+
+  function handleCreate() {
+    newInstanceName = "";
+    showCreateModal = true;
+  }
+
+  function handleEdit(instance: Instance) {
+    selectedInstance = instance;
+    newInstanceName = instance.name;
+    showEditModal = true;
+  }
+
+  function handleDelete(instance: Instance) {
+    selectedInstance = instance;
+    showDeleteConfirm = true;
+  }
+
+  function handleDuplicate(instance: Instance) {
+    selectedInstance = instance;
+    duplicateName = `${instance.name} (Copy)`;
+    showDuplicateModal = true;
+  }
+
+  async function confirmCreate() {
+    if (!newInstanceName.trim()) return;
+    await instancesState.createInstance(newInstanceName.trim());
+    showCreateModal = false;
+    newInstanceName = "";
+  }
+
+  async function confirmEdit() {
+    if (!selectedInstance || !newInstanceName.trim()) return;
+    await instancesState.updateInstance({
+      ...selectedInstance,
+      name: newInstanceName.trim(),
+    });
+    showEditModal = false;
+    selectedInstance = null;
+    newInstanceName = "";
+  }
+
+  async function confirmDelete() {
+    if (!selectedInstance) return;
+    await instancesState.deleteInstance(selectedInstance.id);
+    showDeleteConfirm = false;
+    selectedInstance = null;
+  }
+
+  async function confirmDuplicate() {
+    if (!selectedInstance || !duplicateName.trim()) return;
+    await instancesState.duplicateInstance(selectedInstance.id, duplicateName.trim());
+    showDuplicateModal = false;
+    selectedInstance = null;
+    duplicateName = "";
+  }
+
+  function formatDate(timestamp: number): string {
+    return new Date(timestamp * 1000).toLocaleDateString();
+  }
+
+  function formatLastPlayed(timestamp: number): string {
+    const date = new Date(timestamp * 1000);
+    const now = new Date();
+    const diff = now.getTime() - date.getTime();
+    const days = Math.floor(diff / (1000 * 60 * 60 * 24));
+    
+    if (days === 0) return "Today";
+    if (days === 1) return "Yesterday";
+    if (days < 7) return `${days} days ago`;
+    return date.toLocaleDateString();
+  }
+</script>
+
+<div class="h-full flex flex-col gap-4 p-6 overflow-y-auto">
+  <div class="flex items-center justify-between">
+    <h1 class="text-2xl font-bold text-gray-900 dark:text-white">Instances</h1>
+    <button
+      onclick={handleCreate}
+      class="flex items-center gap-2 px-4 py-2 bg-blue-600 hover:bg-blue-700 text-white rounded-lg transition-colors"
+    >
+      <Plus size={18} />
+      Create Instance
+    </button>
+  </div>
+
+  {#if instancesState.instances.length === 0}
+    <div class="flex-1 flex items-center justify-center">
+      <div class="text-center text-gray-500 dark:text-gray-400">
+        <p class="text-lg mb-2">No instances yet</p>
+        <p class="text-sm">Create your first instance to get started</p>
+      </div>
+    </div>
+  {:else}
+    <div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
+      {#each instancesState.instances as instance (instance.id)}
+        <div
+          class="relative p-4 bg-gray-100 dark:bg-gray-800 rounded-lg border-2 transition-all cursor-pointer hover:border-blue-500 {instancesState.activeInstanceId === instance.id
+            ? 'border-blue-500'
+            : 'border-transparent'}"
+          onclick={() => instancesState.setActiveInstance(instance.id)}
+        >
+          {#if instancesState.activeInstanceId === instance.id}
+            <div class="absolute top-2 right-2">
+              <div class="w-3 h-3 bg-blue-500 rounded-full"></div>
+            </div>
+          {/if}
+
+          <div class="flex items-start justify-between mb-2">
+            <h3 class="text-lg font-semibold text-gray-900 dark:text-white">
+              {instance.name}
+            </h3>
+            <div class="flex gap-1">
+              <button
+                onclick={(e) => {
+                  e.stopPropagation();
+                  handleEdit(instance);
+                }}
+                class="p-1 hover:bg-gray-200 dark:hover:bg-gray-700 rounded transition-colors"
+                title="Edit"
+              >
+                <Edit2 size={16} class="text-gray-600 dark:text-gray-400" />
+              </button>
+              <button
+                onclick={(e) => {
+                  e.stopPropagation();
+                  handleDuplicate(instance);
+                }}
+                class="p-1 hover:bg-gray-200 dark:hover:bg-gray-700 rounded transition-colors"
+                title="Duplicate"
+              >
+                <Copy size={16} class="text-gray-600 dark:text-gray-400" />
+              </button>
+              <button
+                onclick={(e) => {
+                  e.stopPropagation();
+                  handleDelete(instance);
+                }}
+                class="p-1 hover:bg-gray-200 dark:hover:bg-gray-700 rounded transition-colors"
+                title="Delete"
+              >
+                <Trash2 size={16} class="text-red-600 dark:text-red-400" />
+              </button>
+            </div>
+          </div>
+
+          <div class="space-y-1 text-sm text-gray-600 dark:text-gray-400">
+            {#if instance.version_id}
+              <p>Version: <span class="font-medium">{instance.version_id}</span></p>
+            {:else}
+              <p class="text-gray-400">No version selected</p>
+            {/if}
+
+            {#if instance.mod_loader && instance.mod_loader !== "vanilla"}
+              <p>
+                Mod Loader: <span class="font-medium capitalize">{instance.mod_loader}</span>
+                {#if instance.mod_loader_version}
+                  <span class="text-gray-500">({instance.mod_loader_version})</span>
+                {/if}
+              </p>
+            {/if}
+
+            <p>Created: {formatDate(instance.created_at)}</p>
+
+            {#if instance.last_played}
+              <p>Last played: {formatLastPlayed(instance.last_played)}</p>
+            {/if}
+          </div>
+
+          {#if instance.notes}
+            <p class="mt-2 text-sm text-gray-500 dark:text-gray-500 italic">
+              {instance.notes}
+            </p>
+          {/if}
+        </div>
+      {/each}
+    </div>
+  {/if}
+</div>
+
+<!-- Create Modal -->
+{#if showCreateModal}
+  <div class="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50">
+    <div class="bg-white dark:bg-gray-800 rounded-lg p-6 w-96">
+      <h2 class="text-xl font-bold mb-4 text-gray-900 dark:text-white">Create Instance</h2>
+      <input
+        type="text"
+        bind:value={newInstanceName}
+        placeholder="Instance name"
+        class="w-full px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-lg bg-white dark:bg-gray-700 text-gray-900 dark:text-white mb-4"
+        onkeydown={(e) => e.key === "Enter" && confirmCreate()}
+        autofocus
+      />
+      <div class="flex gap-2 justify-end">
+        <button
+          onclick={() => {
+            showCreateModal = false;
+            newInstanceName = "";
+          }}
+          class="px-4 py-2 bg-gray-200 dark:bg-gray-700 text-gray-900 dark:text-white rounded-lg hover:bg-gray-300 dark:hover:bg-gray-600 transition-colors"
+        >
+          Cancel
+        </button>
+        <button
+          onclick={confirmCreate}
+          disabled={!newInstanceName.trim()}
+          class="px-4 py-2 bg-blue-600 text-white rounded-lg hover:bg-blue-700 disabled:opacity-50 disabled:cursor-not-allowed transition-colors"
+        >
+          Create
+        </button>
+      </div>
+    </div>
+  </div>
+{/if}
+
+<!-- Edit Modal -->
+{#if showEditModal && selectedInstance}
+  <div class="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50">
+    <div class="bg-white dark:bg-gray-800 rounded-lg p-6 w-96">
+      <h2 class="text-xl font-bold mb-4 text-gray-900 dark:text-white">Edit Instance</h2>
+      <input
+        type="text"
+        bind:value={newInstanceName}
+        placeholder="Instance name"
+        class="w-full px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-lg bg-white dark:bg-gray-700 text-gray-900 dark:text-white mb-4"
+        onkeydown={(e) => e.key === "Enter" && confirmEdit()}
+        autofocus
+      />
+      <div class="flex gap-2 justify-end">
+        <button
+          onclick={() => {
+            showEditModal = false;
+            selectedInstance = null;
+            newInstanceName = "";
+          }}
+          class="px-4 py-2 bg-gray-200 dark:bg-gray-700 text-gray-900 dark:text-white rounded-lg hover:bg-gray-300 dark:hover:bg-gray-600 transition-colors"
+        >
+          Cancel
+        </button>
+        <button
+          onclick={confirmEdit}
+          disabled={!newInstanceName.trim()}
+          class="px-4 py-2 bg-blue-600 text-white rounded-lg hover:bg-blue-700 disabled:opacity-50 disabled:cursor-not-allowed transition-colors"
+        >
+          Save
+        </button>
+      </div>
+    </div>
+  </div>
+{/if}
+
+<!-- Delete Confirmation -->
+{#if showDeleteConfirm && selectedInstance}
+  <div class="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50">
+    <div class="bg-white dark:bg-gray-800 rounded-lg p-6 w-96">
+      <h2 class="text-xl font-bold mb-4 text-red-600 dark:text-red-400">Delete Instance</h2>
+      <p class="mb-4 text-gray-700 dark:text-gray-300">
+        Are you sure you want to delete "{selectedInstance.name}"? This action cannot be undone and will delete all game data for this instance.
+      </p>
+      <div class="flex gap-2 justify-end">
+        <button
+          onclick={() => {
+            showDeleteConfirm = false;
+            selectedInstance = null;
+          }}
+          class="px-4 py-2 bg-gray-200 dark:bg-gray-700 text-gray-900 dark:text-white rounded-lg hover:bg-gray-300 dark:hover:bg-gray-600 transition-colors"
+        >
+          Cancel
+        </button>
+        <button
+          onclick={confirmDelete}
+          class="px-4 py-2 bg-red-600 text-white rounded-lg hover:bg-red-700 transition-colors"
+        >
+          Delete
+        </button>
+      </div>
+    </div>
+  </div>
+{/if}
+
+<!-- Duplicate Modal -->
+{#if showDuplicateModal && selectedInstance}
+  <div class="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50">
+    <div class="bg-white dark:bg-gray-800 rounded-lg p-6 w-96">
+      <h2 class="text-xl font-bold mb-4 text-gray-900 dark:text-white">Duplicate Instance</h2>
+      <input
+        type="text"
+        bind:value={duplicateName}
+        placeholder="New instance name"
+        class="w-full px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-lg bg-white dark:bg-gray-700 text-gray-900 dark:text-white mb-4"
+        onkeydown={(e) => e.key === "Enter" && confirmDuplicate()}
+        autofocus
+      />
+      <div class="flex gap-2 justify-end">
+        <button
+          onclick={() => {
+            showDuplicateModal = false;
+            selectedInstance = null;
+            duplicateName = "";
+          }}
+          class="px-4 py-2 bg-gray-200 dark:bg-gray-700 text-gray-900 dark:text-white rounded-lg hover:bg-gray-300 dark:hover:bg-gray-600 transition-colors"
+        >
+          Cancel
+        </button>
+        <button
+          onclick={confirmDuplicate}
+          disabled={!duplicateName.trim()}
+          class="px-4 py-2 bg-blue-600 text-white rounded-lg hover:bg-blue-700 disabled:opacity-50 disabled:cursor-not-allowed transition-colors"
+        >
+          Duplicate
+        </button>
+      </div>
+    </div>
+  </div>
+{/if}