DISCUSSIONS on “Rules for online games in HoMM3 and formulas for calculating player rating.”

5.5. The so-called "red rush" is prohibited, meaning that the player playing with the red color is not allowed to attack the blue player on the first day of the week with reinforcements purchased on that day. However, it is allowed to use troops that come with the hero purchased on that day.

In Heroes III, during a network game, there is a bug (many consider it to be a bug) where, during an opponent's turn, you can view their castles and the troops located in them. To do this, you need to enter your castle and right-click on the castle icon in the lower right corner. If you click on your 1st castle, you will see what is happening in the 1st castle of the opponent, on the 2nd - in the 2nd, and so on. If you click, say, on the 3rd castle, and the opponent has only 2 castles, the game will crash (as confirmation of the bug).