Observe Numbers: Make sure your computer speaker is not muted!
While looking at the numbers in the box below, click the "Play tones" button
to listen to these numbers as tones. Some may be too low for you to hear and that's ok.
Observed numbers have been sent, please wait for other users's response...
Press "E" or "O"...
that you take a quick trial where you will be shown several single digit
numbers. For each number, simply press either the "E" or "O" keys depending upon whether the
digit is Even or Odd. Press the key as quickly as you can while being as accurate as you can. When you're ready,
click the button below...