Instructions
Change out the yellow gem on the bottom from the left side of the screen to the right.
Swap this gem back to empty out your third and sixth column.
Take the lower green gem on the left side of the screen over to the right, and continue doing this until the skulls in the middle column have been eliminated.
Swap the yellow gem near the middle upwards to clear out the other three yellow gems above.
Clear out the skulls to create the explosion, which eliminates the rest of the gems and allows you the Elven Guard monster capture.