diff --git a/quiz_game.py b/quiz_game.py
index 082b9be..d00841e 100644
--- a/quiz_game.py
+++ b/quiz_game.py
@@ -1,40 +1,291 @@
-print("Welcome to my computer quiz!")
-
-playing = input("Do you want to play? ")
-
-if playing.lower() != "yes":
-    quit()
-
-print("Okay! Let's play :)")
-score = 0
-
-answer = input("What does CPU stand for? ")
-if answer.lower() == "central processing unit":
-    print('Correct!')
-    score += 1
-else:
-    print("Incorrect!")
-
-answer = input("What does GPU stand for? ")
-if answer.lower() == "graphics processing unit":
-    print('Correct!')
-    score += 1
-else:
-    print("Incorrect!")
-
-answer = input("What does RAM stand for? ")
-if answer.lower() == "random access memory":
-    print('Correct!')
-    score += 1
-else:
-    print("Incorrect!")
-
-answer = input("What does PSU stand for? ")
-if answer.lower() == "power supply":
-    print('Correct!')
-    score += 1
-else:
-    print("Incorrect!")
-
-print("You got " + str(score) + " questions correct!")
-print("You got " + str((score / 4) * 100) + "%.")
\ No newline at end of file
+#!/usr/bin/env python3
+"""
+advanced_quiz.py
+
+Advanced terminal-based quiz:
+- Multiple choice
+- Randomized questions/options
+- Difficulty levels
+- Optional timed questions (Unix only)
+- Stores scores to quiz_scores.json (leaderboard)
+- Easy to extend with external question bank (see QUESTIONS list)
+"""
+
+import json
+import os
+import random
+import sys
+import time
+import datetime
+import platform
+
+# Optional colored output (nice but optional)
+try:
+    from colorama import init as colorama_init, Fore, Style
+    colorama_init(autoreset=True)
+except Exception:
+    class _C:
+        def __getattr__(self, _): return ""
+    Fore = Style = _C()
+
+SCORES_FILE = "quiz_scores.json"
+
+# ---- Sample question bank (replace / load from JSON/CSV if you want) ----
+QUESTIONS = [
+    {
+        "q": "What does CPU stand for?",
+        "choices": ["Central Processing Unit", "Computer Primary Unit", "Central Power Unit", "Control Processing Unit"],
+        "answer": "Central Processing Unit",
+        "difficulty": "easy"
+    },
+    {
+        "q": "What does GPU stand for?",
+        "choices": ["Graphics Processing Unit", "General Processing Unit", "Graphical Program Unit", "Global Processing Unit"],
+        "answer": "Graphics Processing Unit",
+        "difficulty": "easy"
+    },
+    {
+        "q": "What does RAM stand for?",
+        "choices": ["Random Access Memory", "Readily Available Memory", "Random Active Memory", "Rapid Access Memory"],
+        "answer": "Random Access Memory",
+        "difficulty": "easy"
+    },
+    {
+        "q": "Which sorting algorithm has average time complexity O(n log n) and is often used for large datasets?",
+        "choices": ["Bubble sort", "Selection sort", "Merge sort", "Insertion sort"],
+        "answer": "Merge sort",
+        "difficulty": "medium"
+    },
+    {
+        "q": "In Python, what does GIL (Global Interpreter Lock) affect?",
+        "choices": ["I/O performance only", "Ability to use multiple cores for CPU-bound Python bytecode", "Memory allocation", "Garbage collection timing"],
+        "answer": "Ability to use multiple cores for CPU-bound Python bytecode",
+        "difficulty": "medium"
+    },
+    {
+        "q": "Which of the following is a non-relational (NoSQL) database?",
+        "choices": ["PostgreSQL", "MySQL", "MongoDB", "SQLite"],
+        "answer": "MongoDB",
+        "difficulty": "easy"
+    },
+    {
+        "q": "What is the main idea behind Docker?",
+        "choices": ["Virtual machines with full OS", "Containerization for lightweight, portable runtime environments", "A new programming language", "A database engine"],
+        "answer": "Containerization for lightweight, portable runtime environments",
+        "difficulty": "medium"
+    },
+    {
+        "q": "Which neural network architecture is best suited for sequence data like time series or text?",
+        "choices": ["Convolutional Neural Network (CNN)", "Recurrent Neural Network (RNN)", "K-Means", "PCA"],
+        "answer": "Recurrent Neural Network (RNN)",
+        "difficulty": "hard"
+    },
+    {
+        "q": "Which Big O gives worst-case time complexity for QuickSort?",
+        "choices": ["O(n)", "O(n log n)", "O(n^2)", "O(log n)"],
+        "answer": "O(n^2)",
+        "difficulty": "hard"
+    },
+]
+
+# ---- Utility: timed input (Unix-only using signal). Fallback to normal input on Windows ----
+def timed_input(prompt, timeout):
+    """
+    Returns input string if user types within timeout seconds.
+    If platform doesn't support alarm (Windows), returns normal input (no timeout).
+    """
+    if platform.system() == "Windows":
+        # Windows: fallback to normal input (no reliable cross-platform builtin)
+        return input(prompt)
+    else:
+        import signal
+
+        def handler(signum, frame):
+            raise TimeoutError
+
+        old = signal.signal(signal.SIGALRM, handler)
+        signal.alarm(timeout)
+        try:
+            val = input(prompt)
+            signal.alarm(0)
+            return val
+        except TimeoutError:
+            print("\n" + Fore.YELLOW + "Time's up!")
+            return None
+        finally:
+            signal.signal(signal.SIGALRM, old)
+
+
+# ---- Persistence functions ----
+def load_scores():
+    if os.path.exists(SCORES_FILE):
+        try:
+            with open(SCORES_FILE, "r", encoding="utf-8") as f:
+                return json.load(f)
+        except Exception:
+            return []
+    return []
+
+
+def save_score(entry):
+    data = load_scores()
+    data.append(entry)
+    with open(SCORES_FILE, "w", encoding="utf-8") as f:
+        json.dump(data, f, indent=2, ensure_ascii=False)
+
+
+def show_leaderboard(top_n=5):
+    data = load_scores()
+    if not data:
+        print(Fore.CYAN + "No previous results found.")
+        return
+    data_sorted = sorted(data, key=lambda x: x.get("percentage", 0), reverse=True)
+    print(Fore.GREEN + f"\nTop {min(top_n, len(data_sorted))} Leaderboard:")
+    for i, e in enumerate(data_sorted[:top_n], start=1):
+        time_str = e.get("timestamp", "unknown time")
+        print(f"{i}. {e['user']} — {e['score']}/{e['total']} ({e['percentage']:.2f}%) — {time_str}")
+
+
+# ---- Core quiz logic ----
+def run_quiz(user, difficulty="all", timed=False, per_question_time=15, num_questions=None):
+    # Filter questions by difficulty
+    pool = [q.copy() for q in QUESTIONS if difficulty == "all" or q.get("difficulty") == difficulty]
+    if not pool:
+        print(Fore.RED + "No questions match that difficulty.")
+        return
+
+    random.shuffle(pool)
+    if num_questions:
+        pool = pool[:num_questions]
+
+    total = len(pool)
+    score = 0
+    details = []
+
+    print(Fore.CYAN + f"Starting quiz for {user} — {total} questions. Timed mode: {timed}.\n")
+
+    for i, q in enumerate(pool, start=1):
+        # shuffle choices
+        choices = q["choices"].copy()
+        random.shuffle(choices)
+
+        print(Style.BRIGHT + f"Q{i}/{total}: {q['q']}")
+        for idx, ch in enumerate(choices, start=1):
+            print(f"  {idx}. {ch}")
+
+        # get answer (timed or not)
+        prompt = f"Your answer (1-{len(choices)}): "
+        if timed:
+            ans = timed_input(prompt, per_question_time)
+            if ans is None:
+                # timed out
+                user_choice = None
+            else:
+                user_choice = ans.strip()
+        else:
+            user_choice = input(prompt).strip()
+
+        # Validate user input
+        chosen_text = None
+        correct = False
+        if user_choice and user_choice.isdigit():
+            idx = int(user_choice) - 1
+            if 0 <= idx < len(choices):
+                chosen_text = choices[idx]
+                correct = (chosen_text == q["answer"])
+        else:
+            # allow direct text match fallback
+            if user_choice:
+                user_choice_text = user_choice.lower()
+                for ch in choices:
+                    if ch.lower() == user_choice_text:
+                        chosen_text = ch
+                        correct = (ch == q["answer"])
+                        break
+
+        if correct:
+            print(Fore.GREEN + "✔ Correct!\n")
+            score += 1
+            details.append({"question": q["q"], "your": chosen_text, "correct": q["answer"], "result": "correct"})
+        else:
+            print(Fore.RED + f"✖ Incorrect. Correct answer: {q['answer']}\n")
+            details.append({"question": q["q"], "your": chosen_text if chosen_text else "No valid answer", "correct": q["answer"], "result": "incorrect"})
+
+        # small pause to improve UX
+        time.sleep(0.5)
+
+    percentage = (score / total) * 100 if total else 0.0
+
+    print(Style.BRIGHT + Fore.BLUE + "\nQuiz Completed!")
+    print(f"Score: {score}/{total}")
+    print(f"Percentage: {percentage:.2f}%")
+    accuracy = sum(1 for d in details if d["result"] == "correct") / total * 100
+    print(f"Accuracy: {accuracy:.2f}%")
+
+    # Save result
+    entry = {
+        "user": user,
+        "score": score,
+        "total": total,
+        "percentage": percentage,
+        "timestamp": datetime.datetime.now().isoformat(),
+        "details": details
+    }
+    save_score(entry)
+    print(Fore.CYAN + f"\nResult saved to {SCORES_FILE}.")
+    return entry
+
+
+# ---- Interactive launcher ----
+def main():
+    print(Style.BRIGHT + "Welcome to the Advanced Quiz!\n")
+
+    user = input("Enter your name (or nickname): ").strip() or "Anonymous"
+
+    # Difficulty selection
+    print("\nChoose difficulty: [1] Easy  [2] Medium  [3] Hard  [4] All")
+    diff_choice = input("Select (1-4): ").strip()
+    diff_map = {"1": "easy", "2": "medium", "3": "hard", "4": "all"}
+    difficulty = diff_map.get(diff_choice, "all")
+
+    # Timed mode?
+    tm = input("Enable timed questions? (y/N): ").strip().lower()
+    timed = tm == "y"
+
+    per_q_time = 15
+    if timed and platform.system() != "Windows":
+        tval = input(f"Seconds per question (default {per_q_time}): ").strip()
+        if tval.isdigit():
+            per_q_time = max(3, int(tval))
+    elif timed and platform.system() == "Windows":
+        print(Fore.YELLOW + "Timed mode is not supported on Windows reliably. Continuing without timeout.")
+
+    # how many questions
+    max_q = len([q for q in QUESTIONS if difficulty == "all" or q["difficulty"] == difficulty])
+    nq = input(f"How many questions? (max {max_q}, press Enter for all): ").strip()
+    num_q = None
+    if nq.isdigit():
+        num_q = min(int(nq), max_q)
+
+    # Show previous leaderboard
+    lb = input("Show leaderboard before starting? (y/N): ").strip().lower()
+    if lb == "y":
+        show_leaderboard()
+
+    # Run quiz
+    run_quiz(user, difficulty=difficulty, timed=timed and platform.system() != "Windows", per_question_time=per_q_time, num_questions=num_q)
+
+    # After quiz, option to view leaderboard
+    view_lb = input("\nView leaderboard now? (y/N): ").strip().lower()
+    if view_lb == "y":
+        show_leaderboard()
+
+    print("\nThanks for playing! Goodbye.")
+
+
+if __name__ == "__main__":
+    try:
+        main()
+    except KeyboardInterrupt:
+        print("\nInterrupted. Goodbye.")
+        sys.exit(0)
\ No newline at end of file