Press TAB during game play, then activate the following cheats by entering the corresponding codes:

CHEAT FUNCTION - CHEAT CODE
100,000 gold and 100 of each resource - nwctheconstruct
999 Mana and all spells - nwcthereisnospoon
All buildings - nwczion
All war machines - nwclotsofguns
Alternate color scheme - nwcphisherprice
Empty slots filled with 10 black knights - nwcagents
Empty slots filled with 5 archangels - nwctrinity
Full puzzle map - nwcoracle
Full world map - nwcwhatisthematrix
Gain one level - nwcneo
Hide world map - nwcignoranceisbliss
Lose game - nwcbluepill
Maximum Luck - nwcfollowthewhiterabbit
Maximum Morale - nwcmorpheus
Unlimited movement - nwcnebuchadnezzar
Win game - nwcredpill

Start the game with the /nwcgrail command line parameter and press F4 after the game loads. A "Cheat Menu" option will appear in the windowed mode commands at the top of the screen.

Enable the nwczion code to access special structures. All special structures give 50% creature growth, +5000 gold income, and has a special attribute:

STRUCTURE - LOCATION/ATTRIBUTE
Aurora Borealias (Conflux) - Located above castle; all spells.
Spirit Totem (Rampart) - Located beside castle; Luck +2 .
Deity of Fire (Inferno) - Located beside town hall; all weeks declared Week Of The Imp.
Soul Prison (Necropolis) - Located in front of the blacksmith; increases Necromancy skill by 20%.
Carnivorous Plant (Fortress) - Located on a plank in the water; increases attack and defense of a garrison hero in a siege.
Skyship (Tower) - Located behind Temple Of The Clouds; gives full world map, increases defending hero Knowledge +15.
Guardian Of The Earth (Dungeon) - Located under the Dragon Caves; increases defending hero Power +12.

This trick requires gold, your favorite hero, and units. Go to the tavern and select a hero. Notice the units below it, then garrison them and go to battle. Retreat and return to the castle. Notice that your hero is there. Hire the hero again. Once again, notice the units that you started with. Garrison them again. This trick can be repeated. Note: Upgrading them is an option, but gold and the corrected castle is required in order to do that.