黑板和是您可以在UGameZone.com上免费玩的数学游戏之一。通过这个具有挑战性的游戏，让您的数学技能和大脑锻炼。查看黑板上的数字，并仔细地组合一些方程式。您需要加快工作速度，以实现时钟！
Enable Flash in Chrome settings. When Flash is disabled, the label will read " Block sites from running Flash ".Click the toggle to enable flash and the label will read " Ask First ". Shown like the following:
Now Click And then,click " Allow " in the box that appears in the top-left to play the game.Shown like the following:
