[susam]

Thank you. The smileys below the error rate show how happy the tutor is with the user's typing.

There are four smileys:

(｡ʘ‿ʘ｡) - Very happy; error rate is 0% and speed is at least 40 words per minute.

(ʘ‿ʘ) - Happy; error rate is 0% but speed is less than 40 words per minute.

(⊙_⊙) - Unhappy; error rate is greater than 0% but does not exceed 2%.

(⊙⁔⊙) - Sad; error rate exceeds 2%.

Also, see https://github.com/susam/quickqwerty/blob/1362e6d4edd9932b31... and https://github.com/susam/quickqwerty/blob/1362e6d4edd9932b31....

Typing speed is measured in words per minute. Five characters count as a word.

Error rate = number of errors made / number of characters typed correctly * 100%, rounded to the nearest integer.