Type these while playing a scenario.
Code Result
911 - Win Scenario
1313 - Lose Scenario
8675309 - Show Entire Map
123456789 - More Luck for Heroes
32167 - 5 Black Dragons for Hero Selected
844690 - Crystals
899101 - Gems
101111 - Gold
844691 - Ore
101495 - Obelisk Map
1911 - Final Battle
1134 - 100 Titans
1135 - 100 Arch Mages
1136 - 100 Steel Golems
1137 - 100 Rocks
1138 - 100 Halflings

Command Line Cheat
/NWC: A useful cheat that will access the game's debugger. With it you can give your hero extra mobility, free spells, free resources, free creatures, and allow you to select secondary skills. This cheat is NOT typed during the game. It is typed after the line HEROES2W.EXE as an extension (it will look like "HEROES2W.EXE /NWC".) Under Windows 95, you can create a shortcut to Heroes II and under Properties option, change the executable to read HEROES2W.EXE /NWC.