>>480535751. Use the Pickaxe to clear the 3 lines. All of the fossils bar Rare Bone take up 4 or more spaces horizontally, so this method will flush them out. Adjust accordingly for blocks of iron in your way.
2. Use the Pickaxe to check the dots. Most of the valuable items take up 3 spaces horizontally, so this method will flush out almost anything remaining in the wall. Adjust accordingly for blocks of iron in your way.
3. Ignore the Spheres until you’ve revealed everything in the wall. They’re not important enough to sacrifice any of the treasure.
4. If you still haven't revealed everything, then randomly poke at the remaining spaces with the Pickaxe until the wall collapses.
5. Only use the Sledgehammer if it can save you from losing an item. If that’s not enough, then boot up another cartridge and help yourself unearth it.