diff --git a/docs/development/CENTRAL.md b/docs/development/CENTRAL.md
index bec3d7c..997c8ec 100644
--- a/docs/development/CENTRAL.md
+++ b/docs/development/CENTRAL.md
@@ -2,6 +2,7 @@
 
 ## Active Plans
 - [Enhance 3D Game View](./devlog/2025-12-14-235500_enhance_3d_game_view.md): Active. Transforming the battlefield into a fully immersive 3D environment.
+- [Deck Tester Feature](./devlog/2025-12-15-002500_deck_tester_feature.md): Completed. Implemented a dedicated view to parse custom decks and instantly launch the 3D game sandbox.
 - [Game Context Menu & Immersion](./devlog/2025-12-14-235000_game_context_menu.md): Completed. Implemented custom right-click menus and game-feel enhancements.
 
 ## Recent Completions
diff --git a/docs/development/devlog/2025-12-15-002500_deck_tester_feature.md b/docs/development/devlog/2025-12-15-002500_deck_tester_feature.md
new file mode 100644
index 0000000..b2c7add
--- /dev/null
+++ b/docs/development/devlog/2025-12-15-002500_deck_tester_feature.md
@@ -0,0 +1,32 @@
+# Deck Tester Feature Implementation
+
+## Objective
+Create a way to add a cards list to generate a deck and directly enter the game ui to test the imported deck, using the same exact game and battlefield of the draft.
+
+## Implementation Details
+
+### Frontend
+1.  **DeckTester Component (`src/client/src/modules/tester/DeckTester.tsx`)**:
+    - Created a new component that allows users to input a deck list (text area or file upload).
+    - Reused `CardParserService` and `ScryfallService` to parse the list and fetch card data.
+    - Implemented image caching logic (sending to `/api/cards/cache`).
+    - Connects to socket and emits `start_solo_test`.
+    - Upon success, switches view to `GameRoom` with the received `room` and `game` state.
+
+2.  **App Integration (`src/client/src/App.tsx`)**:
+    - Added a new "Deck Tester" tab to the main navigation.
+    - Uses the `Play` icon from lucide-react.
+
+3.  **GameRoom Enhancement (`src/client/src/modules/lobby/GameRoom.tsx`)**:
+    - Added `initialGameState` prop to allow initializing the `GameView` immediately without waiting for a socket update (handling potential race conditions or state sync delays).
+
+### Backend
+1.  **Socket Event (`src/server/index.ts`)**:
+    - Added `start_solo_test` event handler.
+    - Creates a room with status `playing`.
+    - Initializes a game instance.
+    - Adds cards from the provided deck list to the game (library zone).
+    - Emits `room_update` and `game_update` to the client.
+
+## Outcome
+The user can now navigate to "Deck Tester", paste a deck list, and immediately enter the 3D Game View to test interactions on the battlefield. This reuses the entire Draft Game infrastructure, ensuring consistency.
diff --git a/src/client/src/App.tsx b/src/client/src/App.tsx
index 96d4cf9..c311100 100644
--- a/src/client/src/App.tsx
+++ b/src/client/src/App.tsx
@@ -1,12 +1,13 @@
 import React, { useState } from 'react';
-import { Layers, Box, Trophy, Users } from 'lucide-react';
+import { Layers, Box, Trophy, Users, Play } from 'lucide-react';
 import { CubeManager } from './modules/cube/CubeManager';
 import { TournamentManager } from './modules/tournament/TournamentManager';
 import { LobbyManager } from './modules/lobby/LobbyManager';
+import { DeckTester } from './modules/tester/DeckTester';
 import { Pack } from './services/PackGeneratorService';
 
 export const App: React.FC = () => {
-  const [activeTab, setActiveTab] = useState<'draft' | 'bracket' | 'lobby'>('draft');
+  const [activeTab, setActiveTab] = useState<'draft' | 'bracket' | 'lobby' | 'tester'>('draft');
   const [generatedPacks, setGeneratedPacks] = useState<Pack[]>([]);
 
   return (
@@ -34,6 +35,12 @@ export const App: React.FC = () => {
             >
               <Users className="w-4 h-4" /> <span className="hidden md:inline">Online Lobby</span>
             </button>
+            <button
+              onClick={() => setActiveTab('tester')}
+              className={`px-3 md:px-4 py-2 rounded-md text-sm font-bold flex items-center gap-2 transition-all ${activeTab === 'tester' ? 'bg-teal-600 text-white' : 'text-slate-400 hover:text-white'}`}
+            >
+              <Play className="w-4 h-4" /> <span className="hidden md:inline">Deck Tester</span>
+            </button>
             <button
               onClick={() => setActiveTab('bracket')}
               className={`px-3 md:px-4 py-2 rounded-md text-sm font-bold flex items-center gap-2 transition-all ${activeTab === 'bracket' ? 'bg-blue-600 text-white' : 'text-slate-400 hover:text-white'}`}
@@ -53,6 +60,7 @@ export const App: React.FC = () => {
           />
         )}
         {activeTab === 'lobby' && <LobbyManager generatedPacks={generatedPacks} />}
+        {activeTab === 'tester' && <DeckTester />}
         {activeTab === 'bracket' && <TournamentManager />}
       </main>
     </div>
diff --git a/src/client/src/modules/game/GameContextMenu.tsx b/src/client/src/modules/game/GameContextMenu.tsx
index 8f560f0..6fff481 100644
--- a/src/client/src/modules/game/GameContextMenu.tsx
+++ b/src/client/src/modules/game/GameContextMenu.tsx
@@ -1,4 +1,4 @@
-import React, { useEffect, useState } from 'react';
+import React, { useEffect } from 'react';
 import { CardInstance } from '../../types/game';
 
 interface ContextMenuRequest {
@@ -16,7 +16,6 @@ interface GameContextMenuProps {
 }
 
 export const GameContextMenu: React.FC<GameContextMenuProps> = ({ request, onClose, onAction }) => {
-  const [submenu, setSubmenu] = useState<string | null>(null);
 
   useEffect(() => {
     const handleClickOutside = () => onClose();
@@ -59,7 +58,7 @@ export const GameContextMenu: React.FC<GameContextMenuProps> = ({ request, onClo
           <MenuItem label={request.card.faceDown ? "Flip Face Up" : "Flip Face Down"} onClick={() => handleAction('FLIP_CARD', { cardId: request.targetId })} />
 
           <div className="relative group">
-            <MenuItem label="Add Counter ▸" onClick={() => { }} onMouseEnter={() => setSubmenu('counter')} />
+            <MenuItem label="Add Counter ▸" onClick={() => { }} />
             {/* Submenu */}
             <div className="absolute left-full top-0 ml-1 w-40 bg-slate-900 border border-slate-700 rounded shadow-lg hidden group-hover:block">
               <MenuItem label="+1/+1 Counter" onClick={() => handleAction('ADD_COUNTER', { cardId: request.targetId, counterType: '+1/+1', amount: 1 })} />
diff --git a/src/client/src/modules/lobby/GameRoom.tsx b/src/client/src/modules/lobby/GameRoom.tsx
index 110f0f2..2aad8dd 100644
--- a/src/client/src/modules/lobby/GameRoom.tsx
+++ b/src/client/src/modules/lobby/GameRoom.tsx
@@ -31,14 +31,15 @@ interface Room {
 interface GameRoomProps {
   room: Room;
   currentPlayerId: string;
+  initialGameState?: any;
 }
 
-export const GameRoom: React.FC<GameRoomProps> = ({ room: initialRoom, currentPlayerId }) => {
+export const GameRoom: React.FC<GameRoomProps> = ({ room: initialRoom, currentPlayerId, initialGameState }) => {
   const [room, setRoom] = useState<Room>(initialRoom);
   const [message, setMessage] = useState('');
   const [messages, setMessages] = useState<ChatMessage[]>(initialRoom.messages || []);
   const messagesEndRef = useRef<HTMLDivElement>(null);
-  const [gameState, setGameState] = useState<any>(null);
+  const [gameState, setGameState] = useState<any>(initialGameState || null);
 
   useEffect(() => {
     setRoom(initialRoom);
diff --git a/src/client/src/modules/tester/DeckTester.tsx b/src/client/src/modules/tester/DeckTester.tsx
new file mode 100644
index 0000000..59215b6
--- /dev/null
+++ b/src/client/src/modules/tester/DeckTester.tsx
@@ -0,0 +1,180 @@
+import React, { useState, useMemo } from 'react';
+import { Play, Upload, Loader2, AlertCircle } from 'lucide-react';
+import { CardParserService } from '../../services/CardParserService';
+import { ScryfallService, ScryfallCard } from '../../services/ScryfallService';
+import { socketService } from '../../services/SocketService';
+import { GameRoom } from '../lobby/GameRoom';
+
+export const DeckTester: React.FC = () => {
+  const parserService = useMemo(() => new CardParserService(), []);
+  const scryfallService = useMemo(() => new ScryfallService(), []);
+
+  const [inputText, setInputText] = useState('');
+  const [loading, setLoading] = useState(false);
+  const [progress, setProgress] = useState('');
+  const [error, setError] = useState('');
+  const [activeRoom, setActiveRoom] = useState<any>(null);
+  const [initialGame, setInitialGame] = useState<any>(null);
+  const [playerId] = useState(() => Math.random().toString(36).substring(2) + Date.now().toString(36));
+  const [playerName, setPlayerName] = useState('Tester');
+
+  const handleFileUpload = (event: React.ChangeEvent<HTMLInputElement>) => {
+    const file = event.target.files?.[0];
+    if (!file) return;
+    const reader = new FileReader();
+    reader.onload = (e) => setInputText(e.target?.result as string || '');
+    reader.readAsText(file);
+    event.target.value = '';
+  };
+
+  const handleTestDeck = async () => {
+    if (!inputText.trim()) {
+      setError('Please enter a deck list');
+      return;
+    }
+
+    setLoading(true);
+    setError('');
+    setProgress('Parsing deck list...');
+
+    try {
+      // 1. Parse
+      const identifiers = parserService.parse(inputText);
+      const fetchList = identifiers.map(id => id.type === 'id' ? { id: id.value } : { name: id.value });
+
+      // 2. Fetch from Scryfall
+      const expandedCards: ScryfallCard[] = [];
+      await scryfallService.fetchCollection(fetchList, (current, total) => {
+        setProgress(`Fetching cards... (${current}/${total})`);
+      });
+
+      // 3. Expand Quantities
+      identifiers.forEach(id => {
+        const card = scryfallService.getCachedCard(id.type === 'id' ? { id: id.value } : { name: id.value });
+        if (card) {
+          for (let i = 0; i < id.quantity; i++) expandedCards.push(card);
+        } else {
+          console.warn("Card not found:", id.value);
+        }
+      });
+
+      if (expandedCards.length === 0) {
+        throw new Error("No valid cards found in list.");
+      }
+
+      // 4. Cache Images on Server
+      setProgress('Caching images...');
+      const uniqueCards = Array.from(new Map(expandedCards.map(c => [c.id, c])).values());
+      const cardsToCache = uniqueCards.map(c => ({
+        id: c.id,
+        image_uris: { normal: c.image_uris?.normal || c.card_faces?.[0]?.image_uris?.normal || "" }
+      }));
+
+      const cacheResponse = await fetch('/api/cards/cache', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ cards: cardsToCache })
+      });
+
+      if (!cacheResponse.ok) {
+        console.warn("Failed to cache images, proceeding anyway...");
+      }
+
+      // 5. Update cards with local image paths
+      const baseUrl = `${window.location.protocol}//${window.location.host}/cards`;
+      const deckToSend = expandedCards.map(c => ({
+        ...c,
+        image: `${baseUrl}/${c.id}.jpg`
+      }));
+
+      // 6. Connect & Start Solo Game
+      setProgress('Starting game...');
+      if (!socketService.socket.connected) {
+        socketService.connect();
+      }
+
+      const response = await socketService.emitPromise('start_solo_test', {
+        playerId,
+        playerName,
+        deck: deckToSend
+      });
+
+      if (response.success) {
+        setInitialGame(response.game);
+        setActiveRoom(response.room);
+      } else {
+        throw new Error(response.message || "Failed to start game");
+      }
+
+    } catch (err: any) {
+      console.error(err);
+      setError(err.message || "An error occurred");
+    } finally {
+      setLoading(false);
+      setProgress('');
+    }
+  };
+
+  if (activeRoom) {
+    return <GameRoom room={activeRoom} currentPlayerId={playerId} initialGameState={initialGame} />;
+  }
+
+  return (
+    <div className="max-w-4xl mx-auto p-4 md:p-8">
+      <div className="bg-slate-800 rounded-2xl p-8 border border-slate-700 shadow-2xl">
+        <h2 className="text-3xl font-bold text-white mb-2 flex items-center gap-3">
+          <Play className="w-8 h-8 text-emerald-500" /> Deck Tester
+        </h2>
+        <p className="text-slate-400 mb-8">Paste your deck list below to instantly test it on the battlefield.</p>
+
+        {error && (
+          <div className="bg-red-900/50 border border-red-500 text-red-200 p-4 rounded-xl mb-6 flex items-center gap-3">
+            <AlertCircle className="w-5 h-5" />
+            {error}
+          </div>
+        )}
+
+        <div className="space-y-6">
+          <div>
+            <label className="block text-sm font-bold text-slate-300 mb-2">Player Name</label>
+            <input
+              type="text"
+              value={playerName}
+              onChange={(e) => setPlayerName(e.target.value)}
+              className="w-full bg-slate-900 border border-slate-700 rounded-xl p-3 text-white focus:ring-2 focus:ring-emerald-500 outline-none"
+            />
+          </div>
+
+          <div>
+            <div className="flex justify-between items-center mb-2">
+              <label className="text-sm font-bold text-slate-300">Deck List</label>
+              <label className="cursor-pointer text-xs text-blue-400 hover:text-blue-300 flex items-center gap-1 hover:underline">
+                <Upload className="w-3 h-3" /> Upload .txt
+                <input type="file" className="hidden" accept=".txt,.csv" onChange={handleFileUpload} />
+              </label>
+            </div>
+            <textarea
+              className="w-full h-64 bg-slate-900 border border-slate-700 rounded-xl p-4 font-mono text-sm text-slate-300 focus:ring-2 focus:ring-emerald-500 outline-none resize-none placeholder:text-slate-600"
+              placeholder={"4 Lightning Bolt\n4 Mountain\n..."}
+              value={inputText}
+              onChange={(e) => setInputText(e.target.value)}
+              disabled={loading}
+            />
+          </div>
+
+          <button
+            onClick={handleTestDeck}
+            disabled={loading || !inputText}
+            className={`w-full py-4 rounded-xl font-bold text-lg shadow-lg flex justify-center items-center gap-2 transition-all ${loading
+              ? 'bg-slate-700 cursor-not-allowed text-slate-500'
+              : 'bg-gradient-to-r from-emerald-600 to-teal-600 hover:from-emerald-500 hover:to-teal-500 text-white transform hover:scale-[1.01]'
+              }`}
+          >
+            {loading ? <Loader2 className="w-6 h-6 animate-spin" /> : <Play className="w-6 h-6 fill-current" />}
+            {loading ? progress : 'Start Test Game'}
+          </button>
+        </div>
+      </div>
+    </div>
+  );
+};
diff --git a/src/server/index.ts b/src/server/index.ts
index d9a71ba..3e86a9f 100644
--- a/src/server/index.ts
+++ b/src/server/index.ts
@@ -167,6 +167,39 @@ io.on('connection', (socket) => {
     }
   });
 
+  socket.on('start_solo_test', ({ playerId, playerName, deck }, callback) => {
+    // Create new room in 'playing' state (empty packs as not drafting)
+    const room = roomManager.createRoom(playerId, playerName, []);
+    room.status = 'playing';
+
+    // Join socket
+    socket.join(room.id);
+    console.log(`Solo Game started for ${room.id} by ${playerName}`);
+
+    // Init Game
+    const game = gameManager.createGame(room.id, room.players);
+
+    // Load Deck (Expects expanded array of cards)
+    if (Array.isArray(deck)) {
+      deck.forEach((card: any) => {
+        gameManager.addCardToGame(room.id, {
+          ownerId: playerId,
+          controllerId: playerId,
+          oracleId: card.id,
+          name: card.name,
+          imageUrl: card.image || card.image_uris?.normal || card.card_faces?.[0]?.image_uris?.normal || "",
+          zone: 'library'
+        });
+      });
+    }
+
+    // Send Init Updates
+    callback({ success: true, room, game });
+    // Emit updates to ensure client is in sync
+    io.to(room.id).emit('room_update', room);
+    io.to(room.id).emit('game_update', game);
+  });
+
   socket.on('start_game', ({ roomId, decks }) => {
     const room = roomManager.startGame(roomId);
     if (room) {