diff --git a/src/quizLogic/quizAchievements.js b/src/quizLogic/quizAchievements.js
new file mode 100644
index 0000000..961e87c
--- /dev/null
+++ b/src/quizLogic/quizAchievements.js
@@ -0,0 +1,9 @@
+// quizAchievements.js
+// Common achievement logic for all quizzes
+
+export function updateAchievementCount(achievementsComponent) {
+    if (achievementsComponent) {
+        return achievementsComponent.getAchievementCount();
+    }
+    return { unlocked: 0, total: 0 };
+}
diff --git a/src/quizLogic/quizGlobalStats.js b/src/quizLogic/quizGlobalStats.js
new file mode 100644
index 0000000..ed08529
--- /dev/null
+++ b/src/quizLogic/quizGlobalStats.js
@@ -0,0 +1,46 @@
+// quizGlobalStats.js
+// Common global statistics logic for all quizzes
+
+export function loadGlobalStats(key) {
+    const savedGlobalStats = localStorage.getItem(key);
+    if (savedGlobalStats) {
+        try {
+            return JSON.parse(savedGlobalStats);
+        } catch (e) {
+            console.error("Error loading global stats:", e);
+        }
+    }
+    return null;
+}
+
+export function updateGlobalStats(key, quizName, isCorrect, isSkipped = false) {
+    let globalStats = {};
+    const savedGlobalStats = localStorage.getItem(key);
+    if (savedGlobalStats) {
+        try {
+            globalStats = JSON.parse(savedGlobalStats);
+        } catch (e) {
+            console.error("Error parsing global stats:", e);
+        }
+    }
+    if (!globalStats[quizName]) {
+        globalStats[quizName] = { correct: 0, wrong: 0, total: 0, skipped: 0 };
+    }
+    if (!globalStats.overall) {
+        globalStats.overall = { correct: 0, wrong: 0, total: 0, skipped: 0 };
+    }
+    globalStats[quizName].total++;
+    globalStats.overall.total++;
+    if (isSkipped) {
+        globalStats[quizName].skipped++;
+        globalStats.overall.skipped++;
+    } else if (isCorrect) {
+        globalStats[quizName].correct++;
+        globalStats.overall.correct++;
+    } else {
+        globalStats[quizName].wrong++;
+        globalStats.overall.wrong++;
+    }
+    localStorage.setItem(key, JSON.stringify(globalStats));
+    return globalStats;
+}
diff --git a/src/quizLogic/quizSession.js b/src/quizLogic/quizSession.js
new file mode 100644
index 0000000..604bd30
--- /dev/null
+++ b/src/quizLogic/quizSession.js
@@ -0,0 +1,23 @@
+// quizSession.js
+// Common session management logic for all quizzes
+
+export function saveSessionState(key, state) {
+    localStorage.setItem(key, JSON.stringify(state));
+}
+
+export function loadSessionState(key, defaultState) {
+    const savedState = localStorage.getItem(key);
+    if (savedState) {
+        try {
+            return JSON.parse(savedState);
+        } catch (e) {
+            console.error("Error loading session state:", e);
+            return defaultState;
+        }
+    }
+    return defaultState;
+}
+
+export function clearSessionState(key) {
+    localStorage.removeItem(key);
+}
diff --git a/src/quizLogic/quizSettings.js b/src/quizLogic/quizSettings.js
new file mode 100644
index 0000000..41ca17f
--- /dev/null
+++ b/src/quizLogic/quizSettings.js
@@ -0,0 +1,19 @@
+// quizSettings.js
+// Common settings management logic for all quizzes
+
+export function saveSettings(key, settings) {
+    localStorage.setItem(key, JSON.stringify(settings));
+}
+
+export function loadSettings(key, defaultSettings) {
+    const savedSettings = localStorage.getItem(key);
+    if (savedSettings) {
+        try {
+            return JSON.parse(savedSettings);
+        } catch (e) {
+            console.error("Error loading settings:", e);
+            return defaultSettings;
+        }
+    }
+    return defaultSettings;
+}
diff --git a/src/quizLogic/quizSound.js b/src/quizLogic/quizSound.js
new file mode 100644
index 0000000..cc926bc
--- /dev/null
+++ b/src/quizLogic/quizSound.js
@@ -0,0 +1,41 @@
+// quizSound.js
+// Common sound logic for all quizzes
+
+export function playCorrectSound(soundEnabled) {
+    if (!soundEnabled) return;
+    try {
+        const audioContext = new (window.AudioContext || window.webkitAudioContext)();
+        const oscillator = audioContext.createOscillator();
+        const gainNode = audioContext.createGain();
+        oscillator.connect(gainNode);
+        gainNode.connect(audioContext.destination);
+        oscillator.frequency.setValueAtTime(523.25, audioContext.currentTime);
+        oscillator.frequency.setValueAtTime(659.25, audioContext.currentTime + 0.1);
+        oscillator.frequency.setValueAtTime(783.99, audioContext.currentTime + 0.2);
+        gainNode.gain.setValueAtTime(0.3, audioContext.currentTime);
+        gainNode.gain.exponentialRampToValueAtTime(0.001, audioContext.currentTime + 0.4);
+        oscillator.start(audioContext.currentTime);
+        oscillator.stop(audioContext.currentTime + 0.4);
+    } catch (e) {
+        console.log("Audio not supported:", e);
+    }
+}
+
+export function playWrongSound(soundEnabled) {
+    if (!soundEnabled) return;
+    try {
+        const audioContext = new (window.AudioContext || window.webkitAudioContext)();
+        const oscillator = audioContext.createOscillator();
+        const gainNode = audioContext.createGain();
+        oscillator.connect(gainNode);
+        gainNode.connect(audioContext.destination);
+        oscillator.frequency.setValueAtTime(400, audioContext.currentTime);
+        oscillator.frequency.setValueAtTime(300, audioContext.currentTime + 0.15);
+        gainNode.gain.setValueAtTime(0.3, audioContext.currentTime);
+        gainNode.gain.exponentialRampToValueAtTime(0.001, audioContext.currentTime + 0.3);
+        oscillator.start(audioContext.currentTime);
+        oscillator.stop(audioContext.currentTime + 0.3);
+    } catch (e) {
+        console.log("Audio not supported:", e);
+    }
+}