October 7, 2026Practice
Lessons in more languages and first-visit tours
The Learn path adds lessons and problem sets in more languages, including Kotlin, PHP, Dart, and Scala. The Practice page, Puzzle Rush, and your first battle get first-visit tours.
What changed
- The Learn path adds lessons and problem sets in more languages, including Kotlin, PHP, Dart, and Scala. The Practice page, Puzzle Rush, and your first battle get first-visit tours.
- A problem you already solved shows a View Expert Solutions button. The Stuck? bar goes away once you ask Rena.
- Rena's code proposals get Undo after Accept, and an older proposal retires when a newer one arrives. Some statements now show figures we drew.