Delta Green - Starter guide

What is Delta Green?

Delta Green is a horror roleplaying game from Arc Dream Publishing about a secret government organization that protects the United States - and by extension the world - from paranormal and extraterrestrial threats. The setting blends the cosmic horror of H.P. Lovecraft with contemporary conspiracy fiction. Agents work for federal agencies by day: FBI, CIA, military intelligence. When an operation comes in, they drop everything for missions that will never appear in any official record.

The tone sits somewhere between The X-Files and the darkest corners of Lovecraftian horror. This is not a game of swashbuckling investigators destined to save the day. Delta Green is a game about professionals who are slowly ground down by what they witness. Sanity is a limited resource. So are the relationships that keep you together.

How does the system work?

Delta Green uses a percentile system with roots in Call of Cthulhu's Basic Role-Playing. Agents have six core statistics - Strength, Dexterity, Constitution, Intelligence, Power, and Charisma - and a broad set of skills measured in percentages. When a roll is needed, you throw two ten-sided dice and try to land on or under your relevant skill. The higher your skill, the better your odds.

One of the cleverer design decisions is that you often do not roll at all. When circumstances are calm and your skill is high enough, the Handler (the game moderator) simply tells you what you know or what you accomplish. Dice come out when things get dangerous, time-pressured, or genuinely uncertain. Skilled agents feel competent without the tension ever going away.

Combat is fast and brutal. Powerful weapons carry a Lethality rating - a percentile chance to kill outright rather than chip away at hit points. Fights rarely drag on. Neither do the agents who pick them.

The psychological system is where Delta Green truly sets itself apart. Agents track Sanity Points, Willpower Points, and personal Bonds: the people in their lives who keep them anchored. When confronted with unnatural horrors, helplessness, or extreme violence, agents make Sanity rolls. Losing five or more points in a single roll triggers a breaking point - a temporary loss of control that can be catastrophic in a dangerous situation.

The key to managing sanity is projection. When you take psychological damage, you can redirect part of that toll onto a Bond instead. You spare yourself the worst of the shock, but your relationship with someone you care about suffers for it. The next time you interact with that Bond, you describe the fallout. Maybe you lash out. Maybe you disappear. The mechanics and the roleplay reinforce each other in ways that feel like genuine emotional logic.

Between operations, agents get Home Scenes - brief interludes to maintain relationships, improve skills, seek therapy, or pursue personal goals. These scenes make agents feel like real people rather than stat blocks. They also carry mechanical weight: training a skill costs a Bond point as you neglect someone important.

What do you need to start?

The free quickstart - Delta Green: Need to Know - contains enough rules to run the game and includes a ready-to-play operation called "Last Things Last" with six pregenerated agents. It is the easiest possible entry point and it is genuinely good. Download it, read it, run it.

For a full campaign, the Agent's Handbook covers complete character creation and all player-facing rules. The Handler's Guide adds the setting history, factions, entities, rituals, and a starter scenario called "Operation FULMINATE." Both are available as hardcovers or bundled together as the Delta Green slipcase set.

Who is this game for?

Delta Green works best for groups who want horror that feels grounded and psychological rather than pulpy. The game rewards investigation, roleplay, and moral ambiguity. Your agents are not heroes built to prevail - they are professionals trying to minimize damage, cover their tracks, and survive with something resembling sanity intact.

It is a strong fit for fans of The X-Files, True Detective, or the darker end of spy fiction. Players who need mechanical agency over failure - luck points, rerolls, meta-currency - may find Delta Green's refusal to offer those things frustrating. There is no pushing a roll here. You take what you get and you live with it.

The game is also strongly framed around American federal agencies, which shapes character options significantly. If your group prefers non-institutional or non-American protagonists, that will require some creative framing on everyone's part.

How does it differ from other systems?

The most natural comparison is Call of Cthulhu. Both use percentile mechanics and Lovecraftian horror. Delta Green is harder, leaner, and more contemporary. It cuts the luck mechanic, streamlines equipment handling, introduces the Bond system, and leans much further into conspiracy and moral compromise. Call of Cthulhu feels like pulp horror. Delta Green feels like institutional trauma.

Compared to Gumshoe-based games such as Trail of Cthulhu, Delta Green puts more pressure on dice rolls and uncertainty. Gumshoe guarantees that investigators find the clues. Delta Green does not.

Where do you start?

Download Need to Know for free and run "Last Things Last" in one session. Let the scenario do what it was designed to do: establish tone, introduce the dice, and demonstrate why the Bond system actually matters.

After that, pick up the Agent's Handbook and Handler's Guide. For an early campaign, Control Group is a collection of four introductory scenarios designed for players with no prior knowledge of Delta Green - the conspiracy is revealed from the outside in. A Night at the Opera collects six standalone scenarios and works well as building blocks for a first campaign.

When your group is ready for something bigger, Impossible Landscapes is the game's most acclaimed campaign - a multi-part descent into King in Yellow territory that many consider one of the finest campaign books in the hobby. Do not start there. Earn it first.

Recommended products at Netherbook

Delta Green: The Role-Playing Game slipcase set - the complete package in a beautifully sinister box, containing both the Agent's Handbook and Handler's Guide.

Delta Green: A Night at the Opera - six standalone scenarios for building your first campaign.

Delta Green: Impossible Landscapes - the prestige campaign for groups ready to go deep.