Guest mode and the free version allow a limited number of exercises. That's how we can offer the app for free to everyone. How it works:
- When you reach the limit, the app tells you and you need to wait a while before you can keep practicing for free.
- The number of free exercises may vary by region.
- Speed Lab has its own limit, separate from the levels' limit.
- If you leave a level unfinished because of the limit, you'll continue where you left off when you come back.
With Premium there's no daily limit. In some cases you can also get extra attempts.