Activating this trainer:
Press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.
NumPad1: Add Gold
NumPad2: Add Mana
NumPad3: Add Evil
NumPad4: Reveal Map
NumPad5: Research All
NumPad6: Toggle GUI
NumPad7: Win Current Mission
NumPad8: Spawn All Monsters
NumPad9: Spawn Super Monster
NumPad0: Spawn Random Hero
NumPad/: Invincible Units
NumPad*: Spawn Snots
Trainer activation may take a little bit longer on this game. Be patience and wait for 'Trainer activated' sound.
Add Gold / Mana / Evil: Press hotkey to add more of it.
Reveal Map: Press hotkey and the map is fully revealed.
Research All: Press hotkey and everything has been researched.
Win Current Mission: Press hotkey to instantly win the current mission.
Spawn All Monsters: Press hotkey to spawn all monsters at the current viewed location. There needs to be room for them to spawn.
Spawn Super Monster: Similar to spawn all monster cheat but spawns a super monster which is incredible powerful.
Spawn Random Hero: Similar to spawn all monster but spawns a random hero.
Invincible Units: During mission / ingame press hotkey and all of your current units are invincible. This cannot be deactivated except of restarting the mission.
Spawn Random Hero: Similar to spawn all monster but spawns 20 additional snots.
Unlock more trainer options including updates from here - Dungeons 3 Trainer