What's going on

  • Measure how you can concentrate.
  • ... and how the time of day, fatigue, music, rumble
  • affect it
  • Nothing intellectual, just mark all nines in the number matrix.
  • You can tag or untag.
  • If you make a mistake, you can find the error and resubmit (but you'll get as many seconds as the size: 5, 15, 25).
  • There are three job sizes to choose from.
  • You don't have to register or log in, the login is just to mark your results.


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