You can strengthen skills that you've already learned with practice exercises. These can be "timed practices" or "practice without a timer". Unlike the lessons, a practice usually uses vocabulary and grammar that you already "know" from lessons you already passed. Unlike the tests, you can hover over words to get translation hints. There are multiple kinds of exercises
- translation to and from the target language
- select (mark) the correct translations
- type what you hear
Except for level 1, which has 4 hearts, each strengthen skill exercise begins with 3 hearts. You lose a heart each time you make a mistake. After you lose all the hearts another mistake will end the series, and you will not get any experience points. If you complete the series, you gain additional experience points and potentially lingots.