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Write to us here or email [email protected]. We read every message and usually reply within a day.

Quick answers

My code passes locally but the grader says it fails.
Hidden tests check more cases than the visible ones. Read the output pane: it shows the expected and actual output for the failing case.
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I never got the verification email.
Check spam, then use the Resend button in the banner on your dashboard. Links expire after an hour.
Go to dashboard →
Where is my certificate?
It appears on your profile the moment every exercise in a course passes, with a public verification page.
Open profile →
Can I work in VS Code instead of the browser?
Yes. Link a GitHub repository to a course and every push is graded the same way.
Your own editor →

Email [email protected] for anything account-specific. Bugs in a lesson? Say which course and lesson and we fix it in the versioned engine.