加减乘除二十四: 按Go开始。选两张牌，再选所需的运算(+ - x /)。
This is an educational Math game. The objective of the game is to use each of the four cards exactly once and the four arithmetic operations to get 24. To simplify the process, you click two cards first, then an operator. You do not need to consider the order of the cards. A positive number is implied when a "-" or "/" is selected. You then click a remaining card and an operator, or click the two remaining and an operator to perform the second step. The last step will be done automatically by computer to save you from this trivial operation.
For example if you have four cards such as "3", "4", "5", and "7", for answer of the form "(3+5)*(7-4)", you can click "3", "5", "+", "7", "4", "-". For answer of the form "((3*4)+5)+7" or "(5+(3*4))+7" or "7+(5+(3*4))", you click "3", "4", "*", "5", "+".
When you answer correctly, the speed of the animation will go up. When you are in top ten list, your score and time will be saved. This only works when the Applet is loaded locally though.