Your progress

Everything below is checked by the training service against your own workspace. Nothing here is a self-assessment: an exercise counts as complete when its questions are answered correctly, its checks pass, or its story is finished.

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An exercise can go back to unfinished, and that is not a fault. Each check reports how your workspace is now — so an earlier exercise that a later one undid shows as unfinished again, which is usually the more interesting thing to have learned.