In the files of Drill Dozer, a sprite can be found of an "S button", a button that has never existed on Nintendo platforms. It was most likely an attempt at creating a shorthand for Start or Select, as the circular shape of the button resembles the Game Boy Advance, Game Boy Advance SP, and Nintendo GameCube's Start buttons, and the written S was reused for the final game's Start button sprite seen when cracking locks. However, it does not resemble either the Game Boy Micro nor Nintendo DS' Start buttons, both of which were available by the time Drill Dozer released, which alongside "S" being shared as two button's acronyms likely led to the sprite being replaced with one that reads out the entire name of the button and resembles the Start and Select buttons seen on the Micro and DS.