They added new lessons over the last few months and I lost a lot of progress. You can tell the new lessons because they are all have 6 levels. Whenever I see the 0/6 now my heart sinks. These new lessons are really long and extremely difficult in comparison to everything else. They also have lots of "gotcha" questions. It almost feels like they are purposely trying to make you fail. It is now really stressful and daunting, and most of all, it no longer feels fun anymore.