In the past year, I developed several new games in addition to the original solo game.
Math 24 challenge mode: in this game, you can play 5, 10 or 20 puzzles then send the resulted link to your friends. Your score is encrypted in the link. After your friends finish the same puzzles, they can see both scores and know who wins. If you choose to, you could get an instant email with the results. This is great for teachers to assign math 24 puzzles to students.
Kids’ 24 game: in this game, we only allow puzzles that can be solved without divisions and/or multiplications. It’s a great beginner game for kids to learn basic additions, subtractions and multiplications.