Last year we saw The Legend of Zelda: Link’s Awakening partially ported to Microsoft Excel using Visual Basic for Applications (VBA). Redditor crruzi is also using VBA and Excel to make his own XCOM game.
Crruzi says he just learned to use VBA for work and is making EXLCOM to sharpen his skills. EXLCOM takes place “between the events of XCOM:EW and XCOM 2, where a group of guerilla fighters try to liberate their city from ADVENT control.” Don’t expect 3D graphics here. EXLCOM’s graphical interface is closer to a tabletop RPG than a video game. That said, crruzi is implementing class skills, terrain effects and even a variety of weapons and equipment.
You can download a test build of EXLCOM here. It’s still in alpha though; crruzi has finished only the battle system and even then it’s bound to have bugs.