Destructoid has published a speedrun guide for IRON NEST: Heavy Turret Simulator explaining how to trigger the game's fastest, if grimmest, ending, in which the player character turns against their own monarch. The guide targets players who want to reach a conclusion quickly rather than complete the game's intended quest line, though the outlet notes this route leads to a bleak outcome and advises against it as the "proper" way to play.

To trigger the ending, players must first clear the initial mission that unlocks the "Fire and Light" mission, then load a high-explosive shell followed by a powder charge, set the bearing to precisely 327.9 degrees, and raise the gun elevation to exactly 57.12 degrees before firing. The shell strikes a civilian target revealed on the map to be the king, causing the player's Iron Nest turret to self-destruct and kill the player character, ending the game in the quickest possible way but with a downbeat result.