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

It was clear that the expansion was made by a team of multiplayer enthusiasts for multiplayer enthusiasts.

Yes, especially the campaigns, a lot of objects for water (which doesn't exist in online mode) and land (disabled in online templates), most of the maps, and in the upcoming release, even some templates. A huge part of the content has nothing to do with multiplayer, and labeling it as such is inappropriate.