You are lucky to find a very rich deposit of emeralds, rubies, diamonds, amethysts, topazes and other precious and semi-precious stones. But to get to them prevents the rock mass. Huge square boulders blocked the passage and they can only be removed by an explosion. You have a limited supply of TNT, dynamite and bombs, so you need to use it wisely. Take ammunition from the right toolbar and transfer it to the field. Place explosives can only be in places where there are no stones. The highlighted squares will show the radius of the explosion and you will know in advance where to put the charge.