Council Betrayal for OpenXcom is a free mod designed for Windows that expands the gameplay experience by adding four new countries: Mexico, Argentina, Pakistan, and New Zealand. This mod introduces a strategic layer where players must manage the alien influence in these nations. Once a country is infiltrated, an alien base will be established, requiring players to engage in tactical missions to eliminate the threat. Successfully destroying these bases will restore the affected countries' funding and support for the XCom initiative.

This mod not only increases the geographical scope of the game but also adds depth to the narrative and strategic elements. Players are encouraged to adapt their strategies based on the new dynamics introduced by these countries, making for a more engaging and challenging experience. The mod fosters community discussion and collaboration, enhancing the overall enjoyment of OpenXcom.