but instead of making your game look like a spreadsheet, it instead makes your spreadsheet/EDA/IDE turn into a game for a few minutes. call it "safeword" instead of "boss key"
@foone Turbo Vision interface had a mini puzzle game among the widgets one could open. And correct me if I am wrong, but wasn't the Easter Egg of one version of Excel a small wolf3d-like raycasting demo?
(and I am sure that Emacs with all its extensibility had its fair share of games)