Every challenge uses a numbered step sequence. As you mark each step complete, the system updates your position and calculates completion percentage automatically.
Challenges with 15 or more steps include checkpoint milestones at defined intervals. Checkpoints confirm your progress and provide a summary of what has been completed to that point.
Your position in a challenge is stored persistently. You can return after any length of time and resume from the exact step where you left off. No data is lost between sessions.

