Graphics used with permission. See Copyright section.
There are two ways to play.
You can use a multiple choice card to record your answers and see how
many you get correct.
You can measure your knowledge by the speed in which you make it through
the stack. Click on the letter you think is correct. If you're right,
you move forward. If you're wrong, you'll be delayed. Check your time
against the standards provided at the end of the game. Get you stop watch