Digging down is not always the best direction. Do not always tap the square below, especially if you have the space and have a tile that will break in one tap near. Avoid the hard to break tiles because they will drain your pick's power. If you see special stone squares around you, try getting them. Even though you will not get deeper, you will earn money to upgrade the pick. After it can take over 60 digs, begin concentrating on depth. While digging, you may find grenade boxes, gas, and other boosts that will help break tiles. Always collect them because they offer free digs. The least useful boost is the dynamite, which breaks all the tiles horizontally. However, all the others, especially grenades, are very useful.