I consider myself to be an expert digger; I find just about everything in an area, except for the 2x2 spheres in the most inconspituous areas. My secret? I look for the colors of a square one tap before revealing it. If there is a color other than gray or dark gray, I know there is an item behind it. A red sphere would have a pixel or two of red one tap before seeing the revealed square.
If areas have 3x3 boxes of the same density of rubble, I use the sledgehammer. If it's less, I prefer using the pickaxe. I'm a bit conservative when it comes digging, but I gather many spheres and treasures that way. I've gotten multiples of many fossils, all of the plates, many 99 spheres, Stones, Heart Scales, Revives (& Max ones), and hold items with ease.
The number of spheres I have contribute to the amount of goods I have in my secret base; it took me quite some time to list all of the items when checking for duplicates.
So there you have it! My secret to success!
If areas have 3x3 boxes of the same density of rubble, I use the sledgehammer. If it's less, I prefer using the pickaxe. I'm a bit conservative when it comes digging, but I gather many spheres and treasures that way. I've gotten multiples of many fossils, all of the plates, many 99 spheres, Stones, Heart Scales, Revives (& Max ones), and hold items with ease.
The number of spheres I have contribute to the amount of goods I have in my secret base; it took me quite some time to list all of the items when checking for duplicates.
So there you have it! My secret to success!