> For the complete documentation index, see [llms.txt](https://heroicsolo.gitbook.io/heroic-engine/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://heroicsolo.gitbook.io/heroic-engine/basics/publish-your-docs/core-systems.md).

# Core Systems

- [Events Manager](https://heroicsolo.gitbook.io/heroic-engine/basics/publish-your-docs/core-systems/events-manager.md): Presented via IEventsManager interface, this system registers, listens and triggers various events.
- [Input Manager](https://heroicsolo.gitbook.io/heroic-engine/basics/publish-your-docs/core-systems/input-manager.md): Presented via IInputManager interface, this small but useful system provides you with information about player inputs.
- [Localization Manager](https://heroicsolo.gitbook.io/heroic-engine/basics/publish-your-docs/core-systems/localization-manager.md): Presented via ILocalizationManager interface, this system processes localization in your project.
- [LangText component](https://heroicsolo.gitbook.io/heroic-engine/basics/publish-your-docs/core-systems/localization-manager/langtext-component.md)
- [Music Player](https://heroicsolo.gitbook.io/heroic-engine/basics/publish-your-docs/core-systems/music-player.md): This system is able to play music tracks in random order without repeats if its possible.
- [Sounds Manager](https://heroicsolo.gitbook.io/heroic-engine/basics/publish-your-docs/core-systems/sounds-manager.md): Presented by SoundsManager class, this system is able to play plenty of different sounds at the same moment.
- [Time Manager](https://heroicsolo.gitbook.io/heroic-engine/basics/publish-your-docs/core-systems/time-manager.md): Do you need to pause or resume game? Easy! Just use this small system presented by TimeManager class.
- [Scenes Loader](https://heroicsolo.gitbook.io/heroic-engine/basics/publish-your-docs/core-systems/scenes-loader.md): Presented by ScenesLoader class, this system assists you in work with game scenes.
- [Day Time Controller](https://heroicsolo.gitbook.io/heroic-engine/basics/publish-your-docs/core-systems/day-time-controller.md)
- [Weather Controller](https://heroicsolo.gitbook.io/heroic-engine/basics/publish-your-docs/core-systems/weather-controller.md)