diff --git a/src/components/KnowledgeArea.vue b/src/components/KnowledgeArea.vue
index 8434ecf..0eb2b50 100644
--- a/src/components/KnowledgeArea.vue
+++ b/src/components/KnowledgeArea.vue
@@ -2376,41 +2376,41 @@ const startGame = (subject: string, taskIndex: number) => {
       case 'math':
         const mathTasks = ['counting', 'shapes', 'calculation'];
         taskType = mathTasks[taskIndex] || 'counting';
-        gameDataSubject = gameData.math[taskType as keyof typeof gameData.math];
-        startIndex = progress.value.math[taskType as keyof typeof progress.value.math] || 0;
+        gameDataSubject = gameData.math[taskType];
+        startIndex = progress.value.math[taskType] || 0;
         break;
       case 'chinese':
         const chineseTasks = ['radicals', 'pinyin', 'words'];
         taskType = chineseTasks[taskIndex] || 'radicals';
-        gameDataSubject = gameData.chinese[taskType as keyof typeof gameData.chinese];
-        startIndex = progress.value.chinese[taskType as keyof typeof progress.value.chinese] || 0;
+        gameDataSubject = gameData.chinese[taskType];
+        startIndex = progress.value.chinese[taskType] || 0;
         break;
       case 'english':
         const englishTasks = ['maze', 'animal', 'dialogue'];
         taskType = englishTasks[taskIndex] || 'maze';
-        gameDataSubject = gameData.english[taskType as keyof typeof gameData.english];
-        startIndex = progress.value.english[taskType as keyof typeof progress.value.english] || 0;
+        gameDataSubject = gameData.english[taskType];
+        startIndex = progress.value.english[taskType] || 0;
         break;
       case 'science':
         const scienceTasks = ['plants', 'buoyancy', 'colors', 'chemistry', 'physics', 'experiments'];
         taskType = scienceTasks[taskIndex] || 'plants';
-        gameDataSubject = gameData.science[taskType as keyof typeof gameData.science];
-        startIndex = progress.value.science[taskType as keyof typeof progress.value.science] || 0;
+        gameDataSubject = gameData.science[taskType];
+        startIndex = progress.value.science[taskType] || 0;
         break;
       case 'japanese':
         const japaneseTasks = ['hiragana', 'animals', 'fruits', 'body', 'directions', 'items', 'greetings'];
         taskType = japaneseTasks[taskIndex] || 'hiragana';
-        gameDataSubject = gameData.japanese[taskType as keyof typeof gameData.japanese];
-        startIndex = progress.value.japanese[taskType as keyof typeof progress.value.japanese] || 0;
+        gameDataSubject = gameData.japanese[taskType];
+        startIndex = progress.value.japanese[taskType] || 0;
         break;
       case 'geography':
         const geographyTasks = ['map', 'basics', 'northSouth'];
         taskType = geographyTasks[taskIndex] || 'map';
-        gameDataSubject = gameData.geography[taskType as keyof typeof gameData.geography];
-        startIndex = progress.value.geography[taskType as keyof typeof progress.value.geography] || 0;
+        gameDataSubject = gameData.geography[taskType];
+        startIndex = progress.value.geography[taskType] || 0;
         break;
       default:
-        gameDataSubject = gameData[subject as keyof typeof gameData];
+        gameDataSubject = gameData[subject];
         startIndex = 0;
     }