Can you measure up to the challenge? Test the speed and knowledge of your brain and simply click on the measurement. Each correct answer will extend your time on the clock. 2 levels of play. This game was born out of the idea that we (the U.S.A.) are going to be switching to the metric system... I have heard that for the last 20 years and we still have not switched, so it,s high time for everyone to learn to read a ruler. The time has come for you to spank the ruler instead of the ruler spanking your little butt.