diff --git a/PrimePickApp/QuizData/QuizDataManager.swift b/PrimePickApp/QuizData/QuizDataManager.swift
index 3848b7e..71e9114 100644
--- a/PrimePickApp/QuizData/QuizDataManager.swift
+++ b/PrimePickApp/QuizData/QuizDataManager.swift
@@ -9,21 +9,39 @@ import Foundation
 import GameplayKit
 
 class QuizDataManager {
-    func makeQuizData() -> [PrimeQuizEntity] {
+    func makeQuizData(difficulty: String) -> [PrimeQuizEntity] {
         let primeData = PrimeData()
         var quizData: [PrimeQuizEntity] = []
-        let primeNumbers = primeData.generateOneOrTwoDigitPrimes()
         let timestamp = UInt64(Date().timeIntervalSince1970 * 1000)
         var generator = SeededGenerator(seed: timestamp)
 
         for i in 1...10 {
-            let randomInt = Int.random(in: 1...99, using: &generator)
-            let isCorrect = primeNumbers.contains(randomInt)
+            var isCorrect: Bool = false
+            var randomInt: Int = 0
+            if difficulty == "Easy" {
+                randomInt = Int.random(in: 1...99, using: &generator)
+                let primeNumbers = primeData.generateOneOrTwoDigitPrimes()
+                isCorrect = primeNumbers.contains(randomInt)
+            } else if difficulty == "Normal" {
+                randomInt = Int.random(in: 100...999, using: &generator)
+                let primeNumbers = primeData.generateThreeDigitPrimes()
+                isCorrect = primeNumbers.contains(randomInt)
+            } else if difficulty == "Hard" {
+                repeat {
+                    randomInt = Int.random(in: 100...999, using: &generator)
+                } while isMultipleOf235(randomInt)
+                let primeNumbers = primeData.generateThreeDigitPrimes()
+                isCorrect = primeNumbers.contains(randomInt)
+            }
             let primeQuizEntity = PrimeQuizEntity(quizId: i, number: randomInt, isCorrect: isCorrect)
             quizData.append(primeQuizEntity)
         }
         return quizData
     }
+    
+    func isMultipleOf235(_ number: Int) -> Bool {
+        return number % 2 == 0 || number % 3 == 0 || number % 5 == 0
+    }
 }
 
 struct SeededGenerator: RandomNumberGenerator {
diff --git a/PrimePickApp/QuizNumberView.swift b/PrimePickApp/QuizNumberView.swift
index 3d0bbdc..c9ba021 100644
--- a/PrimePickApp/QuizNumberView.swift
+++ b/PrimePickApp/QuizNumberView.swift
@@ -9,6 +9,7 @@ import SwiftUI
 
 struct QuizNumberView: View {
     @Binding var quizNumber: Int
+    let difficulty: String
     let quizData: [PrimeQuizEntity]
     
     var body: some View {
@@ -23,9 +24,15 @@ struct QuizNumberView: View {
                 .frame(width: 300, height: 200) // フレームサイズを指定
                 .shadow(radius: 10) // シャドウを追加して立体感を出す
             
-            Text(quizData[quizNumber].number.description)
-                .font(.custom("ArialRoundedMTBold", size: 180))
-                .foregroundStyle(Color.gray)
+            if difficulty == "Easy" {
+                Text(quizData[quizNumber].number.description)
+                    .font(.custom("ArialRoundedMTBold", size: 180))
+                    .foregroundStyle(Color.gray)
+            } else {
+                Text(quizData[quizNumber].number.description)
+                    .font(.custom("ArialRoundedMTBold", size: 120))
+                    .foregroundStyle(Color.gray)
+            }
         }
     }
 }
@@ -34,6 +41,6 @@ struct QuizNumberView_Previews: PreviewProvider {
     @State static var quizNumber = 3
     
     static var previews: some View {
-        QuizNumberView(quizNumber: $quizNumber, quizData: [PrimeQuizEntity(quizId: 0, number: 3, isCorrect: true)])
+        QuizNumberView(quizNumber: $quizNumber, difficulty: "Easy", quizData: [PrimeQuizEntity(quizId: 0, number: 3, isCorrect: true)])
     }
 }
diff --git a/PrimePickApp/QuizView.swift b/PrimePickApp/QuizView.swift
index e924d8b..57238c5 100644
--- a/PrimePickApp/QuizView.swift
+++ b/PrimePickApp/QuizView.swift
@@ -18,7 +18,7 @@ struct QuizView: View {
     
     init(difficulty: String) {
         self.difficulty = difficulty
-        quizData = manager.makeQuizData()
+        quizData = manager.makeQuizData(difficulty: difficulty)
     }
 
     var body: some View {
@@ -32,6 +32,7 @@ struct QuizView: View {
                 
                 QuizNumberView(
                     quizNumber: $quizNumber,
+                    difficulty: difficulty,
                     quizData: quizData
                 )
                 .frame(height: UIScreen.main.bounds.height / 3)