Optimization
1. Rescue level has been adjusted to player act first, and slightly reduced map size, to improve the success rate of rescue.
2. Rolling stones no longer appears directly next to units, to avoid rolling stones being pushed at the beginnng of level.
3. When a map grid is clicked, corresponding grid icon will be shown, to clearly identify which grid is clicked.
Balancing
1. [Defended] obtained by [Rush to Rescue] is adjusted to +5 from +3.