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Part 1: House Rules and Changes:

This D20 game is a fusion of Darwin’s World (by RPG Objects) and Gamma World D20 (licensed by Wizards of the Coast and written by Arthaus productions, Sword and Sorcery Studio. In order to fully enjoy these pages, you will need a copy of the Gamma World Player’s Handbook, The Darwin’s World Post-Apocalyptic Adventures book, the D20 Modern Roleplaying Game Book (or at least the webpage supplement available on the WOTC website), the Gamma World Mutants & Machines book, and the Gamma World Out of the Vaults book. For the purposes of this document, the following abbreviations apply:
GWPH is the Gamma World Player’s Handbook
DW is Darwin’s World
GWMM is Gamma World Mutants and Machines
OOV is Gamma World Out of the Vaults
D20M is D20 Modern
FF is the D20 Edition Fiend Folio
So, for example if you saw this in the listings: GWPH p. 105 you would know to check the Gamma World Player’s Handbook page number 105 for reference.
As far as I know, I am only presenting viable open game license material in a new format, as well as my own new material. No copyright infringements are intended.

Changes from the Gamma World Core book: Character Creation and System Overhaul:

1. The character creation system in the Gamma World core book is confusing, since it relies on D20 Modern too much to be used as a “stand-alone” book. Choose a background from the Darwin's World book. Then choose a class from any of the stock character classes out of the D20 Modern book, and use either the Modern Talent Trees or the Gamma World Talent Trees. Another good choice would be the Post-Apocalyptic Hero from Darwin’s world. Also, take any of the Darwin’s World or Gamma World Advanced Classes when the characters gain levels, except Nanosmith (for reasons detailed below). There is also the option of choosing any character class from the D20 version 3.5 upgrades from back of the Gamma World Player’s Handbook except Enforcer (which is rather underpowered for some reason). Choose an occupation from those provided in the links below. Choose a Genotype, either genetically modified animal, mutant human, stock human, Pure Strain Human, or Synthetic (Android). Mutants of all types get two minor and one major postitive mutation, and two negative mutations (one of which must be rolled randomly). See the notation on mutations below.
   
   
2. Do not use the Gamma World version of Synthetic Life. Darwin’s World: Metal Gods presents a much more fluid, refined system. You can purchase upgrades from the Gamma World book, however. See the Genotype lists below for statistics.
   
   
3. Do not use the Gamma World Mutations system. Every Mutant is now a template creature from the Darwin’s World book, whether it is an uplifted animal, plant, specifically-bred species or stock human. Roll on the tables provided below to determine your starting Mutations, which take into account all of the GW mutations, some GW mutations from Mutants and Machines, Darwin’s World, and a few I modified from earlier versions of the game. Unlike Darwin’s World, however, mutation is not fixed at birth, and Player Characters may develop more mutations through contact with mutagens in the game. Also, you can advance mutations either at character creation or later in the game, not just at the start. Every Mutant character starts with two minor positive mutations, one major positive mutation, and two minor negative mutations, one of which must be rolled (not chosen). This represents the randomness of mutation.
   
   
4. Do not use the Gamma World cyborg, implants, grafts, nanotechnology, or psionic systems. Redundant, often-confusing systems make the game more complicated and slow down play. Use the Darwin’s World system for psionic/psychic characters, as well as cyborgs. Nanotechnology doesn’t work in our home game version of Gamma World the way it does in the “stock” world. Implants and grafts still work, but are much rarer, and only encompass very few of the many mutations a character can acquire.
   
   
5. Do not use the Gamma World skill or feat system for Technology. Use the Darwin’s World system instead.
   
   
6. Use the modified radiation tables provided below, which are a mesh of both systems.
   
   
7. Ignore the Gamma World Community Creation minigame (unless you REALLY enjoy extraneous numbers in your game. Honestly, there’s enough to keep track of already).
   
   
8. Ignore the Wealth system in Gamma World and D20 Modern. Use the corium system found in Darwin’s World. Just don’t forget to barter in-game!

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