Custom Wars is an open-source turn-based strategy game heavily inspired by the popular Advance Wars series. Players can engage in tactical battles against a friend locally or online, choosing commanders and settings to customize their gameplay experience. The game mechanics mirror those of the original Nintendo title, featuring various unit types like infantry, air, naval units, and tanks, each with unique strengths and weaknesses.

Moreover, Custom Wars offers a comprehensive level editor, enabling players to create and share their own maps with ease. While lacking diverse game modes such as a story mode, the game provides an enjoyable experience for those seeking strategic battles with friends.