No Perfect Copies for OpenXcom is a free mod designed for Windows that enhances the gameplay of the popular strategy game, XCOM. This mod introduces a unique twist by removing the ability to manufacture perfect copies of alien technology, emphasizing the superiority of alien weaponry over human capabilities. Players can still create alien-derived equipment, ensuring that while they can utilize alien advancements, they cannot replicate them exactly. This design choice encourages strategic thinking and adds an extra layer of challenge to the game.

The mod is particularly notable for its focus on realism within the game's context, as it reflects the notion that a less advanced human resistance would struggle to produce weapons that match the effectiveness of alien technology. It is important to note that compatibility with the vanilla game logic is a key aspect of this mod, as it relies on specific gameplay mechanics, such as the inability to capture certain alien units, to function properly.