A strategy for Level 13-7 of DragonScales 3
The key for level 13-7 of DragonScales 3 is to form a way to access the pink scale on the left side at the bottom. Our approach starts by removing the rocks surrounding the central arrow, identified in Figure 1. Remember: to remove rocks just form combinations in adjacent cells.

Figure 1
After removing the rocks, activate the arrow (Figure 2.)

Figure 2
Now focus on the 2 adjacent arrows, on the top row (Figure 3). Activate one of them.

Figure 3
The next step is to activate the bomb to break the block (Figures 4 and 5).

Figure 4

Figure 5
Finally, activate the arrow to lower the column and get access to the pink scale (Figure 6.)

Figure 6
All that remains is capturing the cross pink scales and getting 80 scales of any color.