Just numbers.

You will see a number, remember it and retype it.

If it would be correct, the next number will be one digit longer, when incorrect, game is not ending, only next number will be shorter.

You can see a running average of lengths of last five correctly remembered numbers, in Results you can see the best results for all days and your overall progress.

You can test, how you are influenced by noise, stress etc.

How are you today?