On day 7, visiting the Temple grants a +2 Morale bonus, and the Idol of Fortune provides the hero with +1 to both Morale and Luck.

War Machines are immune to the Implosion spell; however, they remain vulnerable to all other damaging spells.

Press the Space bar to toggle between the surface and underground levels without using any movement points. This function also works with other adventure map objects that allow repeatable actions (e.g. teleports).

If a Hydra attacks multiple creatures that have Fire Shield, it will receive Fire Shield retaliation from each one it hits. This applies to all melee units that strike multiple targets simultaneously.

Among all heroes, only Xarfax (Fireball) and Xyron (Inferno) cannot cast their starting spells at the beginning of the game due to insufficient mana points.

Although not mentioned in the game or manual, both Pikemen and Halberdiers are immune to the Jousting ability of Cavaliers and Champions.

When a hero digs holes along the coastline, it prevents any boats from landing at those spots.

With the Orb of Vulnerability equipped, Berserk can affect Undead creatures. Despite this, they continue to be immune to the Blind spell.

Normally, a hero must reach level 10 to gain the bonus from the Library of Enlightenment. However, the Diplomacy skill reduces this requirement: level 8 with Basic, level 6 with Advanced, and level 4 with Expert.

Disrupting Ray is the only cumulative spell in HoMM III, as it can be cast repeatedly on the same stack to continuously lower its defense. The effect cannot be removed by either Cure or Dispel.