Modding
Software concept
Child groups
| Extensible | Existing content can be extended, adding new characters, enemies, and complementary game logic without replacing the old. | 1978 / 2017 | 119 games | |
| Level editor | Level, map and/or scenario editor is available with the game or from official public sources for free, so players can design their own levels to the game. | 1980 / 2023 | 1042 games | |
| Mod support | Has inbuilt official support for modifications, possibly with tools included to create some or all of mod content. | 2002 / 2020 | 57 games | |
| Modifiable | Existing game logic can be modified or replaced. | 1979 / 2016 | 66 games | |
| Paid mods | Supports paid for game modifications. | 2010 / 2015 | 8 games |