FAQ
Short answers to basic questions
My student can't enter all the digits to complete the answer
I cannot enter my account. What should I do?
I'm getting error code 422. What can I do?
Why does the website appear to be blocked?
What does 'there are no more assigned tasks' mean?
What does “Your rocket is out of fuel” mean?
The sound does not work. What should I do?
Where is Happy Numbers available?