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

I've long agreed with the suggestion to make all HD+ features optional. It would be more convenient for offline play and for enjoying the game, but not for tournaments. Then, each player could customize the settings to their liking. If this were implemented in tournaments, we would be doomed to endless debates about which birds to include and which to exclude. Or, the organizers would dictate this in the rules.