A free program for Android, by feor.

Countdown Numbers is a free math puzzle game based on a game show called “Countdown”. In the game, you will have a limited amount of time to solve a math puzzle, and if you get the answer wrong, you will lose a life. You can only use a limited number of basic math operations, such as addition, subtraction, multiplication, and division. If you get the answer wrong, you will lose a life. You will also have a limited amount of lives, and if you lose all of your lives, you will lose the game.

To play, tap the “Play” button, and then tap the “+” button to add numbers. To subtract numbers, tap the “-” button. To get the correct answer, you must use all of the available numbers, and you must tap the “Show Answer” button to get the correct answer.