This game is like Tic Tac Toe, but instead of X's and O's, you'll use numbers to get to 15! Get ready for a brainteasing number challenge with a friend!

What you'll need:

• A friend to play with

• This webpage (open on a single computer or tablet)

How to play:

1. The Grid: Look at the squares on the screen. It's like a Tic Tac Toe board, but with 9 squares.

2. Your Goal: Be the first player to get three numbers in a row (across, down, or diagonally) that add up to 15!

3. Taking Turns: It's like a guessing game! Click the "Roll" button on your turn. A secret number (1 to 9) will be chosen, but only YOU will see it!

4. Picking Your Spot: Choose any empty square on the board and click it. The secret number will be revealed there! Remember, each number can only be used once!

5. Keeping Track: Look for the used numbers box. As you use numbers, they'll show up there so you and your friend can remember what's been picked.

6. Winning! After each turn, the game will check if someone has a row, column, or diagonal that adds up to 15. If you do, you win!

7. Who's Turn? Look at the message at the top. It will always show whose turn it is (Player 1 or Player 2).

8. Play Again? Once the game is over, you can click the "Reset" button to clear the board and play another round!

Tips for Winning:

• Pay attention to the used numbers box. This will help you guess which numbers might be left to complete a row or column that adds up to 15.

• Think strategically! Don't just pick any empty space. Try to choose a number that helps you get closer to 15 in a row, column, or diagonal.

• Have fun and challenge your friend!