Levels form a path and unlock in order. To open the next level you need to complete the current level with at least the minimum score it requires. When you finish, you'll see your result:
- "¡Nivel superado!" (Level passed!): you reached the minimum and the next level is unlocked.
- "¡Necesitas repasar!" (You need to review!): you didn't reach the minimum. You can repeat the level as many times as you want to improve your result.
Each unlocked level has two modes: normal mode (ordering and pronunciation exercises) and Speed Lab (timed quick questions). On the home screen, tap the level's small bubble to switch modes.
If you leave a level halfway through, you'll continue where you left off when you come back.