Why can't we test past Level 9 (German)?
It would probably attract more native and fluent speakers if we could test out of all exercises.
The gamification also feels incomplete. Perhaps you could earn another heart after 10 correct answers in a row.
It took several tries to reach the end, and the first try was at the last bar when I lost the last heart. Quite frustrating when there are at least three mismarked answers per test.