Hexplore

During a game, press Enter, type 
the code, and press Enter again. 

 Mister White      - God mode
 Talking To Me     - Kills all enemies
 Rat Race          - Full life
 Show              - Display Coordinates 
 Satisfaction      - Temporary weapon speed increase 
                     for selected heroes
 Think Positive    - Temporarily doubles weapon damage for 
                     selected heroes
 What A Difference - Temporary walk speed boost to selected 
                     heroes
 My Drug #         - Gives ammo to the character's selected 
                     weapon 
                     (for example: "My Drug 999" while the 
                     archer's bow is highlighted)
 Glory Day         - No fog.

 I'll Take You There # - Teleports to episode/level 
                     (for example: "I'll Take You There 2" 
                     goes to Episode 0, Level 2)
          

Hexplore - HEXchet
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These are 4 bytes Hex. 
Values can go up to 9,999,999 without system crash.

Health for Adventurer : 004425C8
Health for Archer :     00442D68
Health for Warrior :    00442998
Health for Sorceror :   00443138
Mana for Adventurer :   004425BC
Mana for Archer :       00442D5C
Mana for Warrior :      0044298C
Mana for Sorceror :     0044312C

Archer's Darts :          00442AE4
Archer's Poisoned Bolas : 00442B14
Archer's Crossbow :       00442AF4

Adventurer's Poison :           00442734
Adventurer's Explosive Powder : 004426F4
Adventurer's Healing Potion :   00442744

Warrior's Shockwave :           00442ED4