I can't unlock the Advance Set 2 for "Evaluate Algebraic Expressions" even though the lock symbol is removed. It says that I need to complete the previous set but I have already done it.

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TopNewestOne more bug. I just reported a problem because my answer which being correct was marked wrong. It was fixed by the staff but I wasn't awarded the three stars. If one of the staff members is looking at my post, the problem I reported was from Advance Set 1 under "Rate of change" technique.

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Thanks for letting us know. I will make a tool to mark all completed sets as complete so that you can access the next sets, and I will try to fix the tool that allows our challenge masters to correct problems so that it will check if the change finished the last unfinished problem in the set and if so, mark the set as completed.

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Thanks Sam! :)

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I think it is a bug

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