diff --git a/CLAUDE.md b/CLAUDE.md
index 8c6954a..2920e89 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -56,10 +56,34 @@ src/
 This project uses a carefully chosen combination of specialized libraries rather than trying to force a single library to handle all use cases. This approach provides superior user experience, maintainability, and performance.
 
 ### Core Game Flow
-1. **Image Fetching**: `src/utils/mapillary.js:getRandomMapillaryImage()` fetches random panoramic images via server-side API (`src/app/api/mapillary/route.js`) within predefined Vietnamese city boundaries
-2. **Display**: `src/components/features/PanoViewer.js` renders 360° images using MapillaryJS npm module with fallback to regular images
-3. **Interaction**: `src/components/features/GameMap.js` provides MapLibre GL JS-based interactive map for location guessing
-4. **Scoring**: Distance calculation using haversine formula in `src/utils/distance.js:calculateDistance()`
+
+**Multi-User Gameplay Experience:**
+1. **User Entry**: Home page checks localStorage for cached username, displays popup if not found
+2. **City Selection**: User selects from available Vietnamese cities on home page
+3. **Game Initialization**: Navigate to game scene with selected city parameter
+4. **Image Loading**: Server provides random panoramic image from city bounds via `src/app/api/mapillary/route.js`
+5. **Gameplay**: 
+   - Display raw panoramic image without location metadata
+   - Show city overview map for location guessing
+   - User submits guess location with username
+6. **Scoring System**: Server calculates distance-based points (0-5 scale) per user session:
+   - 0-50m = 5 points
+   - 50m-100m = 4 points
+   - 100m-200m = 3 points
+   - 200m-500m = 2 points
+   - 500m-1km = 1 point
+   - >1km = 0 points
+7. **Results**: 
+   - Show guess location, actual location, distance, and points
+   - Enable MapillaryJS navigation around actual location
+   - "Next" button continues to next round
+
+**Technical Implementation:**
+- **Image Fetching**: `src/utils/mapillary.js:getRandomMapillaryImage()` fetches random panoramic images via server-side API
+- **Display**: `src/components/features/PanoViewer.js` renders raw 360° images using MapillaryJS npm module  
+- **Interaction**: `src/components/features/GameMap.js` provides MapLibre GL JS-based interactive map for location guessing
+- **Scoring**: Enhanced distance calculation with point system in `src/utils/distance.js:calculateDistance()`
+- **Session Management**: Per-user session tracking for concurrent multi-player support
 
 ### Key Components
 - **GameMap**: MapLibre GL JS integration with click-based location selection, automatic centering based on city choice, and native coordinate synchronization
@@ -146,6 +170,17 @@ Game state managed at page level with React hooks:
 - Image fallback system handles panoramic vs regular image display
 
 ### Recent Changes (Completed)
+
+**Multi-User Gameplay Implementation (Latest):**
+- **Username System**: Added localStorage-cached username with popup modal for first-time users
+- **City Selection Interface**: Enhanced home page with username-aware city selection
+- **Per-User Scoring API**: Created `/api/scoring` endpoint with session tracking for concurrent multi-player support
+- **Distance-Based Point System**: Implemented 0-5 point scale based on accuracy (0-50m=5pts, 50m-100m=4pts, 100m-200m=3pts, 200m-500m=2pts, 500m-1km=1pt, >1km=0pts)
+- **Raw Image Display**: Modified PanoViewer to disable navigation controls during gameplay, preventing location information exposure
+- **Enhanced Result Modal**: Added points display, side-by-side map/street view layout, and enabled MapillaryJS navigation in result phase
+- **Game Flow Integration**: Updated game page to handle username parameters, server-side scoring, and fallback error handling
+
+### Recent Changes (Previous)
 - **Structure**: Migrated to standard Next.js `src/` directory structure
 - **Code Organization**: Separated utilities (`src/utils/`), constants (`src/constants/`), UI components (`src/components/ui/`), and feature components (`src/components/features/`)
 - **Import Optimization**: Updated all import paths and added index files for cleaner imports
diff --git a/src/app/api/scoring/route.js b/src/app/api/scoring/route.js
new file mode 100644
index 0000000..9664281
--- /dev/null
+++ b/src/app/api/scoring/route.js
@@ -0,0 +1,72 @@
+import { NextResponse } from 'next/server';
+import { calculateDistance } from '@/utils/distance';
+
+const userSessions = new Map();
+
+function calculatePoints(distanceKm) {
+  if (distanceKm > 1) return 0;
+  if (distanceKm > 0.5) return 1;  
+  if (distanceKm > 0.2) return 2;
+  if (distanceKm > 0.1) return 3;
+  if (distanceKm > 0.05) return 4;
+  return 5;
+}
+
+export async function POST(request) {
+  try {
+    const { username, guessLat, guessLng, trueLat, trueLng, imageId } = await request.json();
+    
+    if (!username || !guessLat || !guessLng || !trueLat || !trueLng || !imageId) {
+      return NextResponse.json(
+        { error: 'Missing required parameters' },
+        { status: 400 }
+      );
+    }
+
+    const sessionId = `${username}_${Date.now()}`;
+    const distance = calculateDistance(guessLat, guessLng, trueLat, trueLng);
+    const points = calculatePoints(distance);
+    
+    const sessionData = {
+      username,
+      imageId,
+      guessLocation: [guessLat, guessLng],
+      trueLocation: [trueLat, trueLng],
+      distance,
+      points,
+      timestamp: new Date().toISOString()
+    };
+
+    userSessions.set(sessionId, sessionData);
+
+    console.log(`Score calculated for ${username}: ${distance.toFixed(2)}km = ${points} points`);
+
+    return NextResponse.json({
+      sessionId,
+      distance,
+      points,
+      username
+    });
+
+  } catch (error) {
+    console.error('Error calculating score:', error);
+    return NextResponse.json(
+      { error: 'Failed to calculate score' },
+      { status: 500 }
+    );
+  }
+}
+
+export async function GET(request) {
+  const { searchParams } = new URL(request.url);
+  const sessionId = searchParams.get('sessionId');
+  
+  if (sessionId && userSessions.has(sessionId)) {
+    return NextResponse.json(userSessions.get(sessionId));
+  }
+  
+  return NextResponse.json(
+    { error: 'Session not found' },
+    { status: 404 }
+  );
+}
\ No newline at end of file
diff --git a/src/app/game/page.js b/src/app/game/page.js
index b670222..25bb876 100644
--- a/src/app/game/page.js
+++ b/src/app/game/page.js
@@ -8,7 +8,7 @@ import PanoViewer from '@/components/features/PanoViewer';
 import GameMap from '@/components/features/GameMap';
 import ResultModal from '@/components/features/ResultModal';
 import { getRandomMapillaryImage } from '@/utils/mapillary';
-import { calculateDistance } from '@/utils/distance';
+import { calculateDistance, calculatePoints } from '@/utils/distance';
 
 function GamePageContent() {
   const router = useRouter();
@@ -18,9 +18,11 @@ function GamePageContent() {
   const [isLoading, setIsLoading] = useState(true);
   const [imageData, setImageData] = useState(null);
   const [choiceLocation, setChoiceLocation] = useState('HN');
+  const [username, setUsername] = useState('');
   const [trueLocation, setTrueLocation] = useState([0, 0]);
   const [guessLocation, setGuessLocation] = useState([0, 0]);
   const [distance, setDistance] = useState(0);
+  const [points, setPoints] = useState(0);
   const [hasGuessed, setHasGuessed] = useState(false);
 
   const loadRandomImage = useCallback(async () => {
@@ -42,10 +44,23 @@ function GamePageContent() {
 
   useEffect(() => {
     const location = searchParams.get('location');
+    const usernameParam = searchParams.get('username');
+    
     if (location) {
       setChoiceLocation(location);
     }
-  }, [searchParams]);
+    
+    if (usernameParam) {
+      setUsername(decodeURIComponent(usernameParam));
+    } else {
+      const cachedUsername = localStorage.getItem('vigeoguessr_username');
+      if (cachedUsername) {
+        setUsername(cachedUsername);
+      } else {
+        router.push('/');
+      }
+    }
+  }, [searchParams, router]);
 
   useEffect(() => {
     loadRandomImage();
@@ -62,24 +77,61 @@ function GamePageContent() {
     setTrueLocation([lat, lng]);
   }, []);
 
-  const handleSubmit = () => {
-    if (!hasGuessed) return;
+  const handleSubmit = async () => {
+    if (!hasGuessed || !username || !imageData) return;
 
-    const dist = calculateDistance(
-      guessLocation[0],
-      guessLocation[1],
-      trueLocation[0],
-      trueLocation[1]
-    );
+    try {
+      const response = await fetch('/api/scoring', {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/json',
+        },
+        body: JSON.stringify({
+          username,
+          guessLat: guessLocation[0],
+          guessLng: guessLocation[1],
+          trueLat: trueLocation[0],
+          trueLng: trueLocation[1],
+          imageId: imageData.id
+        })
+      });
 
-    setDistance(dist);
-    setShowResultModal(true);
+      if (response.ok) {
+        const result = await response.json();
+        setDistance(result.distance);
+        setPoints(result.points);
+        setShowResultModal(true);
+      } else {
+        console.error('Failed to submit score');
+        const fallbackDistance = calculateDistance(
+          guessLocation[0],
+          guessLocation[1],
+          trueLocation[0],
+          trueLocation[1]
+        );
+        setDistance(fallbackDistance);
+        setPoints(calculatePoints(fallbackDistance));
+        setShowResultModal(true);
+      }
+    } catch (error) {
+      console.error('Error submitting score:', error);
+      const fallbackDistance = calculateDistance(
+        guessLocation[0],
+        guessLocation[1],
+        trueLocation[0],
+        trueLocation[1]
+      );
+      setDistance(fallbackDistance);
+      setPoints(calculatePoints(fallbackDistance));
+      setShowResultModal(true);
+    }
   };
 
   const handleNextRound = () => {
     setShowResultModal(false);
     setHasGuessed(false);
     setDistance(0);
+    setPoints(0);
     loadRandomImage();
   };
 
@@ -143,8 +195,10 @@ function GamePageContent() {
       <ResultModal
         isOpen={showResultModal}
         distance={distance}
+        points={points}
         trueLocation={trueLocation}
         guessLocation={guessLocation}
+        imageData={imageData}
         onNextRound={handleNextRound}
       />
 
diff --git a/src/app/globals.css b/src/app/globals.css
index c8f1dc0..8ab7598 100644
--- a/src/app/globals.css
+++ b/src/app/globals.css
@@ -313,6 +313,79 @@ body {
     color: #e6f4e6;
 }
 
+.modal-overlay {
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    background-color: rgba(0, 0, 0, 0.7);
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    z-index: 9999;
+}
+
+.username-modal {
+    max-width: 400px;
+    width: 90%;
+}
+
+.modal-title {
+    font-family: 'Jersey 15', cursive;
+    font-size: 24px;
+    color: #05A38C;
+    margin-bottom: 10px;
+}
+
+.modal-subtitle {
+    font-family: 'Jersey 15', cursive;
+    font-size: 16px;
+    color: #e6f4e6;
+    margin-bottom: 20px;
+}
+
+.username-input {
+    width: 100%;
+    padding: 12px;
+    margin-bottom: 20px;
+    border: 2px solid #05A38C;
+    border-radius: 8px;
+    background-color: #1a1a1a;
+    color: #e6f4e6;
+    font-family: 'Jersey 15', cursive;
+    font-size: 16px;
+    text-align: center;
+}
+
+.username-input:focus {
+    outline: none;
+    border-color: #05A38C;
+    box-shadow: 0 0 0 2px rgba(5, 163, 140, 0.3);
+}
+
+.username-submit-btn {
+    width: 100%;
+    padding: 12px;
+    background-color: #05A38C;
+    color: #fff;
+    border: none;
+    border-radius: 8px;
+    font-family: 'Jersey 15', cursive;
+    font-size: 16px;
+    cursor: pointer;
+    transition: background-color 0.3s;
+}
+
+.username-submit-btn:hover:not(:disabled) {
+    background-color: #048a76;
+}
+
+.username-submit-btn:disabled {
+    background-color: #666;
+    cursor: not-allowed;
+}
+
 .distance-text {
     font-family: 'Jersey 15', cursive;
     font-size: 32px;
diff --git a/src/app/page.js b/src/app/page.js
index b3ae762..0085b64 100644
--- a/src/app/page.js
+++ b/src/app/page.js
@@ -1,17 +1,39 @@
 'use client';
 
-import { useState } from 'react';
+import { useState, useEffect } from 'react';
 import { useRouter } from 'next/navigation';
 import Header from '@/components/ui/Header';
 import DonateModal from '@/components/ui/DonateModal';
+import UsernameModal from '@/components/ui/UsernameModal';
 import { locationNames } from '@/constants/locations';
 
 export default function Home() {
   const [showDonateModal, setShowDonateModal] = useState(false);
+  const [showUsernameModal, setShowUsernameModal] = useState(false);
+  const [username, setUsername] = useState('');
   const router = useRouter();
 
+  useEffect(() => {
+    const cachedUsername = localStorage.getItem('vigeoguessr_username');
+    if (cachedUsername) {
+      setUsername(cachedUsername);
+    } else {
+      setShowUsernameModal(true);
+    }
+  }, []);
+
+  const handleUsernameSubmit = (newUsername) => {
+    setUsername(newUsername);
+    localStorage.setItem('vigeoguessr_username', newUsername);
+    setShowUsernameModal(false);
+  };
+
   const startGame = (location) => {
-    router.push(`/game?location=${location}`);
+    if (!username) {
+      setShowUsernameModal(true);
+      return;
+    }
+    router.push(`/game?location=${location}&username=${encodeURIComponent(username)}`);
   };
 
   return (
@@ -63,6 +85,11 @@ export default function Home() {
         isOpen={showDonateModal}
         onClose={() => setShowDonateModal(false)}
       />
+
+      <UsernameModal
+        isOpen={showUsernameModal}
+        onSubmit={handleUsernameSubmit}
+      />
     </div>
   );
 }
diff --git a/src/components/features/PanoViewer.js b/src/components/features/PanoViewer.js
index d53a9e0..154b968 100644
--- a/src/components/features/PanoViewer.js
+++ b/src/components/features/PanoViewer.js
@@ -20,7 +20,25 @@ export default function PanoViewer({ imageData, isLoading, onPreciseLocationLoad
         viewerRef.current = new Viewer({
           accessToken: process.env.NEXT_PUBLIC_MAPILLARY_ACCESS_TOKEN || 'MLY|24113623194974280|5bf83fa202912f1cc3210b2cf968fb65',
           container: panoRef.current,
-          imageId: imageData.id
+          imageId: imageData.id,
+          component: {
+            attribution: false,
+            bearing: false,
+            cache: false,
+            cover: false,
+            direction: false,
+            image: true,
+            keyboard: false,
+            loading: true,
+            marker: false,
+            mouse: true,
+            pointer: false,
+            popup: false,
+            sequence: false,
+            spatial: false,
+            tag: false,
+            zoom: true
+          }
         });
 
         viewerRef.current.on('image', async (image) => {
diff --git a/src/components/features/ResultModal.js b/src/components/features/ResultModal.js
index 59a9247..78e827e 100644
--- a/src/components/features/ResultModal.js
+++ b/src/components/features/ResultModal.js
@@ -2,17 +2,23 @@
 
 import { useEffect, useRef } from 'react';
 import maplibregl from 'maplibre-gl';
+import { Viewer } from 'mapillary-js';
 import 'maplibre-gl/dist/maplibre-gl.css';
+import 'mapillary-js/dist/mapillary.css';
 
 export default function ResultModal({ 
   isOpen, 
   distance, 
+  points,
   trueLocation, 
   guessLocation, 
+  imageData,
   onNextRound 
 }) {
   const mapRef = useRef(null);
   const mapInstanceRef = useRef(null);
+  const panoRef = useRef(null);
+  const viewerRef = useRef(null);
   const markersRef = useRef([]);
 
   useEffect(() => {
@@ -155,6 +161,60 @@ export default function ResultModal({
     };
   }, [isOpen, trueLocation, guessLocation]);
 
+  // Initialize MapillaryJS viewer in result phase with navigation enabled
+  useEffect(() => {
+    if (!isOpen || !panoRef.current || !imageData) return;
+
+    const initResultViewer = async () => {
+      try {
+        if (viewerRef.current) {
+          viewerRef.current.remove();
+        }
+
+        viewerRef.current = new Viewer({
+          accessToken: process.env.NEXT_PUBLIC_MAPILLARY_ACCESS_TOKEN || 'MLY|24113623194974280|5bf83fa202912f1cc3210b2cf968fb65',
+          container: panoRef.current,
+          imageId: imageData.id,
+          component: {
+            attribution: false,
+            bearing: true,
+            cache: false,
+            cover: false,
+            direction: true,
+            image: true,
+            keyboard: true,
+            loading: true,
+            marker: false,
+            mouse: true,
+            pointer: true,
+            popup: false,
+            sequence: true,
+            spatial: false,
+            tag: false,
+            zoom: true
+          }
+        });
+
+        viewerRef.current.on('image', (image) => {
+          console.log('Result phase MapillaryJS loaded with navigation:', image.id);
+        });
+
+      } catch (error) {
+        console.error('Error initializing result MapillaryJS viewer:', error);
+      }
+    };
+
+    const timer = setTimeout(initResultViewer, 200);
+
+    return () => {
+      clearTimeout(timer);
+      if (viewerRef.current) {
+        viewerRef.current.remove();
+        viewerRef.current = null;
+      }
+    };
+  }, [isOpen, imageData]);
+
   if (!isOpen) return null;
 
   const formatDistance = (dist) => {
@@ -164,22 +224,43 @@ export default function ResultModal({
     return `${dist} M`;
   };
 
-  const getResultMessage = (dist) => {
-    if (dist > 1000) {
-      return "Hmm! Nice try.";
-    } else if (dist > 200) {
-      return "Good job!";
-    }
-    return "Excellent!";
+  const getResultMessage = (dist, pts) => {
+    if (pts >= 5) return "Perfect! 🎯";
+    if (pts >= 4) return "Excellent! 🎉";
+    if (pts >= 3) return "Great job! 👍";
+    if (pts >= 2) return "Good guess! 👌";
+    if (pts >= 1) return "Nice try! 🎯";
+    return "Keep practicing! 💪";
   };
 
   return (
     <div className="modal" style={{ display: 'block' }}>
-      <div className="modal-content">
+      <div className="modal-content" style={{ maxWidth: '90vw', width: '800px' }}>
         <div className="score-text">RESULT</div>
-        <span className="distance-text">{formatDistance(distance)}</span>
-        <div className="container" ref={mapRef} style={{ height: '300px' }}></div>
-        <p>{getResultMessage(distance)}</p>
+        <div style={{ display: 'flex', gap: '20px', alignItems: 'center', marginBottom: '15px' }}>
+          <span className="distance-text">{formatDistance(distance)}</span>
+          <div style={{ 
+            background: '#05A38C', 
+            padding: '8px 16px', 
+            borderRadius: '8px',
+            fontFamily: 'Jersey 15, cursive',
+            fontSize: '24px',
+            color: 'white'
+          }}>
+            {points} POINTS
+          </div>
+        </div>
+        
+        <div style={{ display: 'flex', gap: '15px', height: '300px', marginBottom: '15px' }}>
+          <div ref={mapRef} style={{ flex: 1, minHeight: '300px' }}></div>
+          <div ref={panoRef} style={{ flex: 1, minHeight: '300px', borderRadius: '8px' }}></div>
+        </div>
+        
+        <p style={{ marginBottom: '15px' }}>{getResultMessage(distance, points)}</p>
+        <p style={{ fontSize: '14px', color: '#ccc', marginBottom: '15px' }}>
+          You can now explore around the actual location using the street view!
+        </p>
+        
         <button onClick={onNextRound} className="next-btn">
           <div className="next-text">NEXT ROUND</div>
         </button>
diff --git a/src/components/ui/UsernameModal.js b/src/components/ui/UsernameModal.js
new file mode 100644
index 0000000..cd3f069
--- /dev/null
+++ b/src/components/ui/UsernameModal.js
@@ -0,0 +1,44 @@
+'use client';
+
+import { useState } from 'react';
+
+export default function UsernameModal({ isOpen, onSubmit }) {
+  const [username, setUsername] = useState('');
+
+  const handleSubmit = (e) => {
+    e.preventDefault();
+    if (username.trim()) {
+      onSubmit(username.trim());
+    }
+  };
+
+  if (!isOpen) return null;
+
+  return (
+    <div className="modal-overlay">
+      <div className="modal-content username-modal">
+        <h2 className="modal-title">Welcome to VIET NAM GUESSR!</h2>
+        <p className="modal-subtitle">Enter your username to start playing</p>
+        
+        <form onSubmit={handleSubmit}>
+          <input
+            type="text"
+            value={username}
+            onChange={(e) => setUsername(e.target.value)}
+            placeholder="Your username"
+            className="username-input"
+            maxLength={20}
+            autoFocus
+          />
+          <button
+            type="submit"
+            className="username-submit-btn"
+            disabled={!username.trim()}
+          >
+            START PLAYING
+          </button>
+        </form>
+      </div>
+    </div>
+  );
+}
\ No newline at end of file
diff --git a/src/components/ui/index.js b/src/components/ui/index.js
index da083c3..cc2f777 100644
--- a/src/components/ui/index.js
+++ b/src/components/ui/index.js
@@ -1,2 +1,3 @@
 export { default as Header } from './Header';
-export { default as DonateModal } from './DonateModal';
\ No newline at end of file
+export { default as DonateModal } from './DonateModal';
+export { default as UsernameModal } from './UsernameModal';
\ No newline at end of file
diff --git a/src/utils/distance.js b/src/utils/distance.js
index 87da068..43e1fa2 100644
--- a/src/utils/distance.js
+++ b/src/utils/distance.js
@@ -29,4 +29,20 @@ export function calculateDistance(lat1, lon1, lat2, lon2) {
   dist = dist * 1609.34; // Convert to meters
   
   return parseFloat(dist.toFixed(1));
+}
+
+/**
+ * Calculates points based on distance (in meters)
+ * @param {number} distanceMeters - Distance in meters
+ * @returns {number} Points (1-5 scale)
+ */
+export function calculatePoints(distanceMeters) {
+  const distanceKm = distanceMeters / 1000;
+  
+  if (distanceKm > 1) return 0;
+  if (distanceKm > 0.5) return 1;  
+  if (distanceKm > 0.2) return 2;
+  if (distanceKm > 0.1) return 3;
+  if (distanceKm > 0.05) return 4;
+  return 5;
 }
\ No newline at end of file