Please note that this cave can be completed in less energy using upgraded tools and/or weapons.
1-2: Immediately dig through dirt block 1 and stone 2, avoiding the falling boulder. Do not waste any time or the puzzle will be very difficult to complete.
3-7: Clear the pathway to the underground spring, then use your sponges to dry it up.
8-11: Dig through the gravel and make your way to the evil eye and kill it.
12-14: Break through the walls and kill the bat.
15-19: Push the red button, opening door A. Grab the silver key and open the silver door. Grab the gold key and open the treasure!
(Uses 34 energy without using upgraded tools/weapons)