Open the "ge3.ini" file in the "/gothic3/ini" directory and find:
[Game]
TestMode=false
Change it to:
[Game]
TestMode=true
During the game, press ~ to display and enter one of the following codes:
God mode: God
Invisibility mode: Invisibility
Restore health: fullhealth
All armors: give Cat_Armor
Learn all skills: Teach all
All weapons: give Cat_Weapon
All artefacts: give Cat_Artefact
Kills selected target: Kill
Spawn indicated item: Give [item name]
Show commands: Help
Control character: control
Control camera: watch
Spawn indicated item: Spawn [item name]
Set dexterity: teach DEX [number]
Set intelligence: teach INT [number]
Set alchemy skill: teach ALC [number]
Set mana: teach MP [number]
Get indicated amount of gold: Give gold [number]
Get indicated amount of gold: Give money [number]
Get all items and skills: idkfa
Set strength: teach STR [number]
Set smith skill: teach SMT [number]
Set thief skill: teach THF [number]
Set health: teach HP [number]
Set energy: teach SP [number]
Set learning points: teach LP [number]