Can I repeat levels I've already passed?

Yes, as many times as you want. A completed level stays open forever on the map: you just enter and practice normally. It’s a great way to review without losing your place in the course, and you keep earning experience.

When it’s worth repeating

• After a long break, to get your touch back before moving forward.
• When you keep making mistakes with a specific key: go back to the level that introduced it.
• If you have changed your keyboard or layout and notice you are failing where you didn’t before.

To review in a targeted way, you also have the Warm-up of the Day, which chooses only the keys you struggle with the most, and the N-Gram Master, which works on your weakest letter combinations.