diff --git a/.needle-predispatch-sha b/.needle-predispatch-sha
index 4f51683..7c0fcbb 100644
--- a/.needle-predispatch-sha
+++ b/.needle-predispatch-sha
@@ -1 +1 @@
-3ae35ea00abe6123fd9b0b045ae8d61b2eaf9685
+508dc0c2e89849e9c383ec27150cdfd446368c52
diff --git a/web/public/test-replay-viewer-bundled.html b/web/public/test-replay-viewer-bundled.html
new file mode 100644
index 0000000..3398231
--- /dev/null
+++ b/web/public/test-replay-viewer-bundled.html
@@ -0,0 +1,261 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Replay Viewer Test - Real Replay</title>
+  <style>
+    body { margin: 0; padding: 20px; font-family: sans-serif; background: #0f172a; color: #e2e8f0; }
+    h1 { font-size: 1.2rem; margin-bottom: 10px; }
+    .test-container { display: flex; gap: 20px; flex-wrap: wrap; }
+    .viewer-section { flex: 1; min-width: 500px; }
+    .results-section { width: 350px; background: #1e293b; padding: 15px; border-radius: 8px; max-height: 80vh; overflow-y: auto; }
+    .canvas-wrapper { background: #1e293b; border-radius: 8px; padding: 10px; }
+    canvas { display: block; }
+    .test-result { padding: 8px; margin: 5px 0; border-radius: 4px; font-size: 12px; }
+    .pass { background: #22c55e; color: white; }
+    .fail { background: #ef4444; color: white; }
+    .info { background: #3b82f6; color: white; }
+    .controls { margin-top: 15px; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
+    button { padding: 8px 16px; background: #3b82f6; color: white; border: none; border-radius: 4px; cursor: pointer; }
+    button:hover { background: #2563eb; }
+    button:disabled { background: #475569; cursor: not-allowed; }
+    #turn-info { font-family: monospace; }
+    .sparkline-container { margin-top: 15px; }
+  </style>
+</head>
+<body>
+  <h1>Replay Viewer Test - Real Replay (m_tprjf4ij)</h1>
+  <div class="test-container">
+    <div class="viewer-section">
+      <div class="canvas-wrapper">
+        <canvas id="replay-canvas"></canvas>
+      </div>
+      <div class="controls">
+        <button id="play-btn" disabled>Play</button>
+        <button id="pause-btn" disabled>Pause</button>
+        <button id="next-btn" disabled>+1 Turn</button>
+        <button id="prev-btn" disabled>-1 Turn</button>
+        <button id="reset-btn" disabled>Reset</button>
+        <select id="speed-select">
+          <option value="50">Fast (50ms)</option>
+          <option value="100" selected>Normal (100ms)</option>
+          <option value="200">Slow (200ms)</option>
+          <option value="500">Very Slow (500ms)</option>
+        </select>
+        <span id="turn-info">Loading...</span>
+      </div>
+      <div class="sparkline-container" id="sparkline"></div>
+      <div style="margin-top: 15px;">
+        <h3>Transcript (Current Turn)</h3>
+        <div id="transcript" style="background: #1e293b; padding: 10px; border-radius: 8px; min-height: 60px; font-size: 13px; max-height: 200px; overflow-y: auto;"></div>
+      </div>
+    </div>
+    <div class="results-section">
+      <h2>Test Results</h2>
+      <div id="test-results"></div>
+    </div>
+  </div>
+
+  <script type="module">
+    // Use the vite dev server import path
+    import { ReplayViewer } from '/src/replay-viewer.ts';
+
+    const results = document.getElementById('test-results');
+    const canvas = document.getElementById('replay-canvas');
+    const turnInfo = document.getElementById('turn-info');
+    const transcript = document.getElementById('transcript');
+    const sparklineContainer = document.getElementById('sparkline');
+    const playBtn = document.getElementById('play-btn');
+    const pauseBtn = document.getElementById('pause-btn');
+    const nextBtn = document.getElementById('next-btn');
+    const prevBtn = document.getElementById('prev-btn');
+    const resetBtn = document.getElementById('reset-btn');
+    const speedSelect = document.getElementById('speed-select');
+
+    let viewer;
+    let testsPassed = 0;
+    let testsFailed = 0;
+
+    function addResult(name, passed, message) {
+      const div = document.createElement('div');
+      div.className = `test-result ${passed ? 'pass' : 'fail'}`;
+      div.textContent = `${passed ? '✓' : '✗'} ${name}: ${message}`;
+      results.appendChild(div);
+      if (passed) testsPassed++;
+      else testsFailed++;
+      results.scrollTop = results.scrollHeight;
+    }
+
+    function addInfo(message) {
+      const div = document.createElement('div');
+      div.className = 'test-result info';
+      div.textContent = message;
+      results.appendChild(div);
+      results.scrollTop = results.scrollHeight;
+    }
+
+    async function runTests() {
+      addInfo('Starting replay viewer tests...');
+      try {
+        // Test 1: Fetch real replay data
+        addInfo('Loading real replay from /data/real-replay.json...');
+        const response = await fetch('/data/real-replay.json');
+        if (!response.ok) throw new Error(`HTTP ${response.status}`);
+        const replay = await response.json();
+        addResult('Fetch real replay', true, `Loaded ${replay.match_id}`);
+
+        // Test 2: Verify replay structure
+        addResult('Replay has match_id', !!replay.match_id, replay.match_id);
+        addResult('Replay has players', Array.isArray(replay.players) && replay.players.length > 0, `${replay.players.length} players`);
+        addResult('Replay has turns', Array.isArray(replay.turns) && replay.turns.length > 0, `${replay.turns.length} turns`);
+        addResult('Replay has map', !!replay.map, `${replay.map.rows}x${replay.map.cols}`);
+        addResult('Replay has result', !!replay.result, `Winner: player ${replay.result.winner}, reason: ${replay.result.reason}`);
+
+        // Test 3: Check for win probability data
+        if (replay.win_prob && replay.win_prob.length > 0) {
+          addResult('Replay has win_prob data', true, `${replay.win_prob.length} entries`);
+        } else {
+          addResult('Replay has win_prob data', false, 'No win_prob data (sparkline will be empty)');
+        }
+
+        // Test 4: Create viewer
+        addInfo('Creating ReplayViewer...');
+        viewer = new ReplayViewer(canvas, { cellSize: 12 });
+        addResult('Create ReplayViewer', true, 'Viewer instance created with cellSize=12');
+
+        // Test 5: Set up callbacks
+        viewer.onTurnChange = (turn) => {
+          turnInfo.textContent = `Turn: ${turn}/${viewer.getTotalTurns() - 1}`;
+          const transcriptText = viewer.getTranscriptForTurn(turn);
+          transcript.textContent = transcriptText || 'No events this turn';
+          viewer.refreshWinProbSparkline?.();
+        };
+
+        viewer.onPlayStateChange = (playing) => {
+          playBtn.disabled = playing;
+          pauseBtn.disabled = !playing;
+        };
+
+        // Test 6: Load replay
+        addInfo('Loading replay into viewer...');
+        viewer.loadReplay(replay);
+        addResult('Load replay into viewer', true, `Loaded ${replay.turns.length} turns`);
+
+        // Test 7: Verify viewer state after load
+        addResult('Get total turns', viewer.getTotalTurns() === replay.turns.length, `${viewer.getTotalTurns()} turns`);
+        addResult('Get current turn', viewer.getTurn() === 0, `Turn ${viewer.getTurn()}`);
+
+        // Test 8: Test turn navigation
+        addInfo('Testing turn navigation...');
+        viewer.setTurn(10);
+        addResult('Set turn to 10', viewer.getTurn() === 10, `Turn ${viewer.getTurn()}`);
+        viewer.setTurn(0);
+        addResult('Reset to turn 0', viewer.getTurn() === 0, `Turn ${viewer.getTurn()}`);
+
+        // Test 9: Test playback controls
+        addInfo('Testing playback controls...');
+        viewer.play();
+        addResult('Start playback', viewer.getIsPlaying(), 'Playing');
+        await new Promise(r => setTimeout(r, 200));
+        viewer.pause();
+        addResult('Pause playback', !viewer.getIsPlaying(), 'Paused');
+
+        // Test 10: Test speed control
+        viewer.setSpeed(50);
+        addResult('Set speed to 50ms', viewer.getSpeed() === 50, `Speed: ${viewer.getSpeed()}ms`);
+        viewer.setSpeed(200);
+        addResult('Set speed to 200ms', viewer.getSpeed() === 200, `Speed: ${viewer.getSpeed()}ms`);
+
+        // Test 11: Set up win probability sparkline
+        addInfo('Setting up win probability sparkline...');
+        if (replay.win_prob && replay.win_prob.length > 0) {
+          const points = replay.win_prob.map((wp, idx) => ({
+            turn: idx,
+            probs: wp.probs || [0.5, 0.5]
+          }));
+          viewer.setWinProbabilityData(points);
+
+          const playerColors = replay.players.map((_, i) => {
+            const colors = ['#3b82f6', '#ef4444', '#22c55e', '#f59e0b', '#8b5cf6', '#06b6d4'];
+            return colors[i % colors.length];
+          });
+          viewer.setWinProbPlayerColors(playerColors);
+
+          viewer.createWinProbSparkline(sparklineContainer, 600, 80, (turn) => {
+            viewer.setTurn(turn);
+          });
+          addResult('Create win prob sparkline', true, 'Sparkline created');
+        } else {
+          addResult('Create win prob sparkline', false, 'No win_prob data available');
+          sparklineContainer.innerHTML = '<div style="color: #64748b; font-style: italic;">No win probability data available</div>';
+        }
+
+        // Test 12: Test transcript generation
+        addInfo('Testing transcript generation...');
+        const fullTranscript = viewer.generateTranscript();
+        addResult('Generate full transcript', Array.isArray(fullTranscript) && fullTranscript.length > 0, `${fullTranscript.length} entries`);
+
+        if (fullTranscript.length > 0) {
+          transcript.textContent = fullTranscript[0].text;
+          addResult('First turn transcript', !!fullTranscript[0].text, 'Has transcript text');
+        }
+
+        // Test 13: Test events API
+        const events = viewer.getTurnEvents();
+        addResult('Get turn 0 events', Array.isArray(events), `${events.length} events at turn 0`);
+
+        // Test 14: Test critical moments
+        if (replay.critical_moments && replay.critical_moments.length > 0) {
+          addResult('Has critical moments', true, `${replay.critical_moments.length} moments`);
+          viewer.setCriticalMoments(replay.critical_moments.map(m => ({
+            turn: m.turn,
+            delta: m.delta,
+            description: m.description
+          })));
+        } else {
+          addResult('Has critical moments', false, 'No critical moments data');
+        }
+
+        // Summary
+        addInfo(`Tests completed: ${testsPassed} passed, ${testsFailed} failed`);
+
+        // Enable controls
+        playBtn.disabled = false;
+        pauseBtn.disabled = true;
+        nextBtn.disabled = false;
+        prevBtn.disabled = false;
+        resetBtn.disabled = false;
+
+      } catch (error) {
+        addResult('Test execution', false, error.message);
+        console.error(error);
+      }
+    }
+
+    // Wire up controls
+    playBtn.addEventListener('click', () => viewer.play());
+    pauseBtn.addEventListener('click', () => viewer.pause());
+    nextBtn.addEventListener('click', () => {
+      if (viewer.getTurn() < viewer.getTotalTurns() - 1) {
+        viewer.setTurn(viewer.getTurn() + 1);
+      }
+    });
+    prevBtn.addEventListener('click', () => {
+      if (viewer.getTurn() > 0) {
+        viewer.setTurn(viewer.getTurn() - 1);
+      }
+    });
+    resetBtn.addEventListener('click', () => {
+      viewer.pause();
+      viewer.setTurn(0);
+    });
+    speedSelect.addEventListener('change', (e) => {
+      viewer.setSpeed(parseInt(e.target.value));
+    });
+
+    // Run tests
+    runTests();
+  </script>
+</body>
+</html>
diff --git a/web/test-replay-viewer.html b/web/test-replay-viewer.html
new file mode 100644
index 0000000..fbb3bc6
--- /dev/null
+++ b/web/test-replay-viewer.html
@@ -0,0 +1,206 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>AI Code Battle - Replay Viewer Test</title>
+  <style>
+    * { box-sizing: border-box; margin: 0; padding: 0; }
+    body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background-color: #0f172a; color: #e2e8f0; padding: 20px; }
+    h1 { margin-bottom: 20px; }
+    .test-section { margin-bottom: 30px; padding: 15px; background-color: #1e293b; border-radius: 8px; }
+    .test-section h2 { font-size: 1.1rem; margin-bottom: 10px; color: #94a3b8; }
+    .test-result { margin: 5px 0; padding: 5px 10px; border-radius: 4px; font-family: monospace; font-size: 0.9rem; }
+    .test-result.pass { background-color: #064e3b; color: #86efac; }
+    .test-result.fail { background-color: #7f1d1d; color: #fca5a5; }
+    .test-result.running { background-color: #451a03; color: #fcd34d; }
+    #test-log { max-height: 300px; overflow-y: auto; background-color: #0f172a; padding: 10px; border-radius: 4px; font-family: monospace; font-size: 0.8rem; margin-top: 10px; }
+    .replay-wrapper { position: relative; width: 100%; max-width: 1000px; }
+    canvas { display: block; }
+  </style>
+</head>
+<body>
+  <h1>AI Code Battle - Replay Viewer Test Suite</h1>
+
+  <div class="test-section">
+    <h2>Test Controls</h2>
+    <button id="run-all-tests">Run All Tests</button>
+    <button id="clear-results">Clear Results</button>
+  </div>
+
+  <div class="test-section">
+    <h2>Test Results</h2>
+    <div id="test-results"></div>
+  </div>
+
+  <div class="test-section">
+    <h2>Replay Viewer</h2>
+    <div class="replay-wrapper">
+      <canvas id="replay-canvas" width="890" height="950"></canvas>
+    </div>
+  </div>
+
+  <div class="test-section">
+    <h2>Test Log</h2>
+    <div id="test-log"></div>
+  </div>
+
+  <script type="module" src="/src/main.ts"></script>
+  <script type="module">
+    // Test harness - runs after main.ts initializes
+    const testResults = [];
+    const testLog = [];
+
+    function log(message) {
+      testLog.push(`[${new Date().toISOString()}] ${message}`);
+      document.getElementById('test-log').innerHTML = testLog.join('<br>');
+    }
+
+    function addResult(testName, status, details) {
+      testResults.push({ name: testName, status, details });
+      const resultDiv = document.getElementById('test-results');
+      const resultEl = document.createElement('div');
+      resultEl.className = `test-result ${status}`;
+      resultEl.textContent = `[${status.toUpperCase()}] ${testName}: ${details}`;
+      resultDiv.appendChild(resultEl);
+    }
+
+    // Wait for viewer to be initialized
+    setTimeout(() => {
+      window.testViewer = viewer;
+      log('Test harness initialized');
+
+      document.getElementById('run-all-tests').addEventListener('click', runAllTests);
+      document.getElementById('clear-results').addEventListener('click', () => {
+        testResults.length = 0;
+        testLog.length = 0;
+        document.getElementById('test-results').innerHTML = '';
+        document.getElementById('test-log').innerHTML = '';
+      });
+    }, 2000);
+
+    async function runAllTests() {
+      log('Starting test suite...');
+      document.getElementById('test-results').innerHTML = '';
+
+      // Test 1: Load real replay
+      await testLoadRealReplay();
+
+      // Wait for viewer to process
+      await sleep(500);
+
+      // Test 2: Canvas renders elements
+      await testCanvasRendering();
+
+      // Test 3: Playback controls
+      await testPlaybackControls();
+
+      // Test 4: Transcript generation
+      await testTranscriptGeneration();
+
+      // Test 5: Win probability (if available)
+      await testWinProbability();
+
+      log('Test suite completed!');
+    }
+
+    async function testLoadRealReplay() {
+      const testName = 'Load Real Replay';
+      try {
+        const response = await fetch('/data/real-replay.json');
+        if (!response.ok) throw new Error(`HTTP ${response.status}`);
+        const replay = await response.json();
+
+        window.testViewer.loadReplay(replay);
+        addResult(testName, 'pass', `Loaded match ${replay.match_id} with ${replay.turns.length} turns`);
+        log(`Loaded replay: ${replay.match_id}, players: ${replay.players.map(p => p.name).join(', ')}`);
+      } catch (e) {
+        addResult(testName, 'fail', e.message);
+        log(`Error loading replay: ${e.message}`);
+      }
+    }
+
+    async function testCanvasRendering() {
+      const testName = 'Canvas Renders Elements';
+      const canvas = document.getElementById('replay-canvas');
+      const ctx = canvas.getContext('2d');
+
+      // Check if canvas has content
+      const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
+      const hasContent = imageData.data.some((channel, i) => i % 4 !== 3 && channel !== 0);
+
+      if (hasContent) {
+        addResult(testName, 'pass', 'Canvas has rendered content');
+        log('Canvas rendering: OK');
+      } else {
+        addResult(testName, 'fail', 'Canvas appears empty');
+        log('Canvas rendering: FAILED - empty canvas');
+      }
+    }
+
+    async function testPlaybackControls() {
+      const v = window.testViewer;
+
+      // Test turn navigation
+      const initialTurn = v.getTurn();
+      v.setTurn(initialTurn + 5);
+      if (v.getTurn() === initialTurn + 5) {
+        addResult('Turn Navigation', 'pass', 'Turn scrubbing works');
+      } else {
+        addResult('Turn Navigation', 'fail', 'Turn scrubbing failed');
+      }
+
+      // Test play/pause
+      v.play();
+      await sleep(100);
+      if (v.getIsPlaying()) {
+        addResult('Play Control', 'pass', 'Play starts playback');
+        v.pause();
+        if (!v.getIsPlaying()) {
+          addResult('Pause Control', 'pass', 'Pause stops playback');
+        } else {
+          addResult('Pause Control', 'fail', 'Pause did not stop playback');
+        }
+      } else {
+        addResult('Play Control', 'fail', 'Play did not start playback');
+      }
+
+      // Reset
+      v.setTurn(0);
+    }
+
+    async function testTranscriptGeneration() {
+      const v = window.testViewer;
+      try {
+        const transcript = v.generateTranscript();
+        if (transcript.length > 0) {
+          addResult('Transcript Generation', 'pass', `Generated ${transcript.length} transcript entries`);
+          log(`Transcript test: First entry - ${transcript[0].text.substring(0, 50)}...`);
+        } else {
+          addResult('Transcript Generation', 'fail', 'No transcript entries generated');
+        }
+      } catch (e) {
+        addResult('Transcript Generation', 'fail', e.message);
+      }
+    }
+
+    async function testWinProbability() {
+      const v = window.testViewer;
+      const replay = v.getReplay();
+
+      if (!replay.win_prob || replay.win_prob.length === 0) {
+        addResult('Win Probability', 'pass', 'No win_prob data in replay (skipped)');
+        log('Win probability: Not available in this replay');
+        return;
+      }
+
+      addResult('Win Probability', 'pass', `Has win_prob data for ${replay.win_prob.length} turns`);
+      log(`Win probability: Available for ${replay.win_prob.length} turns`);
+    }
+
+    function sleep(ms) {
+      return new Promise(resolve => setTimeout(resolve, ms));
+    }
+  </script>
+</body>
+</html>
