The Mole Cricket Hole is an area in Mother 3 that you go to in order to reach the top of the mountain. Here, you will find the Mole Cricket that you fought in the beginning of the game, the Mole Cricket Elder, and many other Mole Crickets. This place is a huge maze that requires the Mole Cricket Brother, which is the little brother of the first Mole Cricket you see. He will chew some roots for you so that you can get across. It's a normal, easy, maze, but you just need to know what to do. Turn at every place you can, and you'll make it through.
The Mole Cricket Hole only appears in Mother 3. The hole to enter is near the Chimera Lab, and the Mole Cricket you saw earlier will take you there once you are finished with everything. You will battle him again, and then you will go through the maze to get to the top of the mountain. This is the only way to get to the area with one of the Seven Needles, and one of the Magypsies.