The ranking of the best open-source video games in the list is based on several factors:

1. Popularity: The popularity and user base of the game were considered. Games that have a large and active community were ranked higher.

2. Quality: The overall quality of the game, including graphics, gameplay mechanics, and user experience, was taken into account. Games that have received positive reviews and have a high level of polish were given higher rankings.

3. Development Activity: The level of ongoing development and support for the game were considered. Games that have active developers and frequent updates were ranked higher.

4. Features and Content: The depth and variety of features, game modes, and content available in the game were considered. Games that offer a rich and engaging experience were given higher rankings.

5. Longevity: The longevity and historical significance of the game were also taken into account. Games that have been around for a longer time and have established themselves as notable open-source projects were given higher rankings.

It's important to note that the ranking is subjective and may vary based on individual preferences. The list aims to provide a diverse selection of high-quality open-source games that have gained recognition within the open-source gaming community.
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