Learn the reflection rule
Before moving toward the exit, map which side of the mirror controls each copy and where a swap would place you. A useful setup often looks wrong until the final exchange.
- Count equal distances from the mirror
- Preserve a safe landing tile
- Move the mirror before moving the hero when possible
Levels 22 and 23
These late routes are commonly missed because reaching them depends on overworld access as well as solving the visible island. Recheck nearby connections and completed paths instead of treating the numbered island as isolated.