The following alterations are intended to streamline the d20 Modern rule set into something a bit easier to tackle, or are necessary for the setting. Most of these modifications are inspired by the Pathfinder RPG.

Hit Dice:

All classes have their hit dice based on their Base Attack Bonus, as follows:

Slow BAB Progression (+0,+1,+1,+2,+2...): d6 Hit Die
Medium BAB Progression (+0,+1,+2,+3,+3...): d8 Hit Die
Full BAB Progression (+1,+2,+3,+4,+5...): d10 Hit Die, except where higher.

Skill List:

Acrobatics (Dex): Combines the Balance, Jump, and Tumble skills.
Bluff (Cha): Unchanged
Climb (Str): Unchanged
Computer Use (Int): Unchanged
Craft (Int): Unchanged, though the acquisition of materials may be difficult.
Demolitions (Int): Unchanged
Diplomacy (Cha): Also includes Gather Information
Disable Device (Int): Unchanged
Disguise (Cha) Unchanged
Drive (Dex): Unchanged
Escape Artist (Dex): Unchanged
Handle Animal (Cha): Unchanged
Intimidate (Cha): Unchanged
Investigate (Int): Unchanged
Knowledge (Int): Unchanged
Linguistics (Int): Combines the Decipher Script, Forgery, Read/Write Language, and Speak Language skills.
Perception (Wis): Combines the Listen, Search, and Spot skills.
Perform (Cha): Unchanged
Pilot (Dex): Unchanged, though see the entry for the Aircraft Operation feat below.
Profession (Wis): Unchanged, though it will not be used to generate Wealth bonus.
Repair (Int): Unchanged
Research (Int): Unchanged
Ride (Dex): Unchanged
Sense Motive (Wis): Unchanged
Sleight of Hand (Dex): Unchanged
Stealth (Dex): Combines the Hide and Move Silently skills.
Survival (Wis): Also incorporates the Navigate skill.
Swim (Str): Unchanged
Treat Injury (Wis): Unchanged

Feats:

Aircraft Operation: Characters investing at least 4 ranks in Pilot get this feat for free for one aircraft type of their choosing.
Armor Proficiency (Light): All Morrow Project team members gain this feat at creation.
Personal Firearms Proficiency: All Morrow Project team members gain this feat at creation.
Surface Vehicle Operation: All Morrow Project team members are assumed to be proficient in the operation of all vehicles assigned to their team.
Windfall: Removed

Equipment:

Morrow Project team members have their equipment provided for them by the project, and the economies of the modern world are completely absent in the post-apocalypse, so the Wealth system will not be used at all. The Trade Unit system from d20 Apocalypse, while appropriate for some games, is not appropriate for the Morrow Project, so will not be implemented.

See the Starting Equipment page for further details.

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House Rules

Initiative: Players have 24 hours to respond to a call for Initiative before combat starts. After that period, any players who have not posted Initiative will come in on their roll in the next applicable round.