diff --git a/Day04/ts/solution.ts b/Day04/ts/solution.ts
new file mode 100644
index 0000000..0d8b54b
--- /dev/null
+++ b/Day04/ts/solution.ts
@@ -0,0 +1,75 @@
+import * as fs from 'fs';
+
+interface Card {
+    cardNumber: number;
+    winningNumbers: Set<number>;
+    ownNumbers: number[];
+}
+
+// Parses a line of card data and returns the card number, winning numbers, and own numbers
+function parseCardData(line: string): Card {
+    const [cardInfo, numberParts] = line.split(':');
+    const [winningPart, ownPart] = numberParts.split('|');
+    const cardNumber = parseInt(cardInfo.match(/\d+/)![0], 10);
+    const winningNumbers = new Set(winningPart.trim().split(/\s+/).map(Number));
+    const ownNumbers = ownPart.trim().split(/\s+/).map(Number);
+    return { cardNumber, winningNumbers, ownNumbers };
+}
+
+// Calculates the number of matches for a card
+function calculateMatches(winningNumbers: Set<number>, ownNumbers: number[]): number {
+    return ownNumbers.reduce((count, number) => count + (winningNumbers.has(number) ? 1 : 0), 0);
+}
+
+// Processes the cards and returns the total number of cards including copies
+function processCards(cards: Card[]): number {
+    let totalCards = cards.length;
+    const queue: Card[] = cards.slice(); // Clone the original array to avoid modifying it
+
+    while (queue.length > 0) {
+        const currentCard = queue.shift()!;
+        const matches = calculateMatches(currentCard.winningNumbers, currentCard.ownNumbers);
+        for (let i = 1; i <= matches; i++) {
+            if (currentCard.cardNumber + i < cards.length) {
+                totalCards++;
+                queue.push(cards[currentCard.cardNumber + i - 1]);
+            }
+        }
+    }
+
+    return totalCards;
+}
+
+// Reads the file and processes the cards
+function processFile(filePath: string): number | null {
+    try {
+        const data = fs.readFileSync(filePath, 'utf-8');
+        const lines = data.trim().split('\n');
+        const cards = lines.map(parseCardData);
+        return processCards(cards);
+    } catch (error: any) {
+        console.error(`Error processing file ${filePath}: ${error.message}`);
+        return null;
+    }
+}
+
+// Test function
+function test() {
+    const expectedResult = 30;
+    const result = processFile('../test.txt');
+    console.assert(result === expectedResult, `Test failed: Expected ${expectedResult}, got ${result}`);
+    console.log(`Test passed: ${result} cards`);
+}
+
+// Main function
+function main() {
+    try {
+        test();
+        const totalCards = processFile('../input.txt');
+        console.log(`Total cards from input.txt: ${totalCards}`);
+    } catch (error: any) {
+        console.error(`An error occurred: ${error.message}`);
+    }
+}
+
+main();