Show Unique Images to user

index.html

@@ -142,8 +142,13 @@
     highscoreElement.textContent = highscore;
 
     function preloadImages(count = 20) {
+      const uniqueIndexes = new Set();
       for (let i = 1; i <= count; i++) {
-        const index = Math.floor(Math.random() * totalImages) + 1;
+        let index = Math.floor(Math.random() * totalImages) + 1;
+        while (uniqueIndexes.has(index)) {
+          index = Math.floor(Math.random() * totalImages) + 1;
+        }
+        uniqueIndexes.add(index);
         const paddedIndex = index.toString().padStart(2, '0');
 
         const realImg = new Image();