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

If you're referring to me, I don't see a difference – you can remember the map without performing any actions (that's what I meant by inactivity, i.e., everything remains as it is during the opponent's turn). But if that's too complicated, you can just use a black screen – let them use the auto-battle feature; it will also improve security).