games that were released with "unrealized coding" left hidden in it?

seeing this topic here
made me think a bit about that for a while before deciding to ask that topic question here..
any games that had something obvious in its ux and/or engine code that could-had-been but was never actually utilized in any way?

mind you this is for windows not macos but I remember somewhere in the late 2000's finding out about that the 'hover!' game for windows 95 was supposed to have a level editor but the only thing that remained was the hidden(not displayed) 'editor' physical button for the main screen's gui
 
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