HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

For owners of monitors with high resolutions, work has been underway for some time to resize the image in real time. For example, so that it would be possible to set 1180x664 and play in fullscreen on a 1920x1080 monitor.
But a solution that is both fast and visually appealing has not yet been implemented.