Update to v1.07 and press [S] or [B] in the game to get to the start screen, here
just type

MARVIN

Now the cheat mode and the console are activated.

(If you have a version < v1.07: In the file gothic.ini change test mode from 0 to 1,
then you can press [F2] in the game to activate the console, here type in:

cheat god    God mode
cheat full   Heal
hurtswampschark Hurt shark
harpie     Harpie
lurker     Lurker
lichtbringer  Artefact (probably for a quest)
kill      Kills selected enemy (no experience points gained)
remove     Turn back into a hero (in case you are a creature)

insert [item] Create an item/Charcter where [item] might be:

        Weapons:

        torlofsaxt
        roter_wind
        ulumulu
        artos_schwert
        silax_axt
        diegos_bogen
        thorus_schwert
        whislers_schwert
        innos_zorn
        scars_schwert
        gornsrache

        Monster:

        udshaman_rockefeller
        icegolem
        freemineorc
        meatbug
        bridgegolem
        troll
        youngtroll
        yscavenger
        ymolerat
        xardasdemon
        swampshark

        Weitere Leute:

        btestmodell
        ctestmodell
        dtestmodell
        ftestmodell
        gtestmodell
        htestmodell
        jtestmodell
        ababetestmodell
        perception_testmodell)
        atestmodell

        Magic:

        urizielrune
        xp_map
        neks_amulett
        cords_spalter
        prankenhieb
        namibskeule

        Armor:  dmb_armor_m
            grd_armor_i
            ore_armor_m
            ore_armor_h



        Mana:  elementare_arcanei

        Other items:

        astronomie
        dungeonkey
        fakescroll
        zeitenklinge
        victim
        self
        healwather

edit abilities Type then EXP = XXXX

autocomplement Complete cheats automatically ON/OFF

create     Exact notation still missing
camera     Exact notation still missing
print     Exact notation still missing
parerd     Exact notation still missing
set      Exact notation still missing
soundstat   Exact notation still missing


You also can press the following keys in the game

[F3]    Play in windows modw
[F4]    Normal mode
[F5]    Immobile camera
[F6]    Mobile camera
[F7]    Cycle trough game sections
[F8]    Health and mana refresh

[H]    Character harms himself
[Z]    Character spins around
[K]    Character vanishes in the ground (press multiple times)

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Blood mode:

In file gothic.ini change bloodDetail from 1 to 3