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

I agree with Roman. Even though I'm slow-witted, and it might be worse for me, I'm in favor of using chess clocks. After all, any mental operations should be performed within the player's allotted time. For people who like to think, discuss, have a beer, etc., there can be an unlimited time limit by mutual agreement, but in a tournament setting, it should be this way. IMHO.