Holez, Spikez and Rockz room
First, you should have your Shovel Grunt at full health!

Cross over one Spikez Tile and turn one Hole into a Mound (if you are a purist, continue to leave behind an ordinary Tile ).
Cross over one Spikez Tile and turn two Holez into Moundz (if you are a purist, continue to leave behind ordinary Tilez ... if you can ... you might be rewarded with a Coin).
But then, perhapz a picture is worth a thousand wordz.
A 'purist' will finish with the area looking like this.