
Delta Green TTRPG · Delta Green: The Role-Playing Game
Delta Green
Delta Green places you in the role of investigators who know too much. Modern cities, quiet suburbs, and treacherous backroads conceal impossible truths. Cases begin like a police procedural, then twist into a sense of creeping dread. The atmosphere is tense, grounded, and tragic. It is beloved for its blend of clue-hunting, human drama, and cosmic horror that does not shy away. This is an excellent choice if you enjoy thrillers and the uncanny, or wish to explore Cosmic Horror with a clear mission ahead of you.
With a professional Game Master, a session feels like a sharp investigation under pressure. You interrogate witnesses, sift through evidence, and determine how far to push. Your choices carry weight. Violence is swift and costly. The tone and intensity are tailored to your group, and safety tools are standard. Ideal for beginners who prioritise story, as well as veterans seeking grit. Perfect for 2 to 5 adults, whether in one-shots for tense evenings or linked operations for a slow-burn campaign.
How to play Delta Green
You roll percentile dice, which consist of two ten-sided dice that represent a number from 1 to 100. When attempting something risky, you aim to roll equal to or below your skill level. Describe your actions, ask questions, and follow the clues. The Game Master will only call for a roll when the outcome is uncertain. In combat, decisions are swift and ruthless. When faced with the impossible, you must test your sanity to continue.
You should come prepared with a clear character concept, a few personal Bonds, and a readiness to investigate. A professional Game Master provides the mission brief, engaging NPCs, maps, handouts, and ensures careful pacing. They adjust the mystery and horror to suit your comfort level, ranging from tense to terrifying. If you have specific preferences regarding tone, check GM playstyles and request an investigative, gritty, or psychological focus.
One-shots unfold a single operation in one session. Pre-generated agents are typical, and the story has a distinct beginning and end. Campaigns connect multiple operations with downtime, home scenes, and significant consequences. You will observe stress and secrets accumulate over time, and minor choices may come back to haunt you. The rules remain centred on investigation, consequence, and survival in both formats.


Common questions
Do I need to know the rules before we start playing?
No prior knowledge of the rules is required. The system is simple: you roll two ten-sided dice to generate a percentage. If your roll is below your skill level, you succeed. The Game Master will explain the rules as they arise and keep the game flowing. Your focus will be on choices, clues, and consequences, rather than calculations. If you are already familiar with Delta Green, the GM can incorporate any optional tweaks you prefer. Either way, you’ll be playing with confidence in just a few minutes.
How frightening is it, and how do you manage safety?
Delta Green is intense, adult horror. Themes can include violence, gore, and psychological stress. Before play, your GM establishes lines and veils with you, and employs safety tools like pauses and check-ins during the game. You decide how far to turn the dial, from moody thriller to harsh horror. Consequences matter, but player comfort is paramount. To align tone and content with your preferences, explore GM styles here: GM playstyles.
What group size and session length are most effective?
It shines with 2 to 5 players. Fewer agents create a more surgical and tense atmosphere. Larger teams bring in more skills and crossfire, but also attract more attention. A typical operation lasts 3 to 4 hours. One-shots usually fit into a single session. Campaign play maintains the same session length, with occasional debriefs or home scenes as time permits. Your Game Master will adjust the pacing and clue density to suit the group, ensuring everyone gets their moment in the spotlight.
How does Delta Green differ from D&D?
It is modern, grounded, and investigation-led. There are no classes or levels. You create an agent with skills, a job, and personal connections. Combat is quick, lethal, and typically a last resort. Supernatural elements are rare, unknowable, and perilous to utilise. Sanity and Bonds measure the personal cost of the work. In contrast to D&D’s heroic fantasy and dungeon crawls, Delta Green is more akin to crime drama mixed with cosmic horror and covert operations.
Which edition and ruleset do you use?
Sessions use Delta Green, The Role-Playing Game from 2016. Players follow the rules in the Agent’s Handbook. The GM operates from the Handler’s Guide. Core mechanics include percentile skills, Lethality for certain firearms, and Stress and Sanity with Bonds. If you have specific preferences, the GM can incorporate or omit optional tweaks to suit your group. Both published scenarios and original cases are available to meet your objectives and time constraints.
Should we create our own agents or use pre-generated ones?
Both options are viable. For a one-shot, pre-generated agents allow you to jump straight into the case and come with built-in hooks. For longer campaigns, creating your own agent helps you engage with Bonds and background more deeply. Group creation typically takes around 30 to 45 minutes, using profession templates such as law enforcement, science, military, or academia. You select stats, assign skills, and define Bonds. If you have an existing agent, the GM can adjust them to fit this ruleset.
Can we play online, and what equipment do we need?
Yes. Delta Green works brilliantly online as evidence, maps, photos, and audio clues are easily shared. All you need is a computer, a microphone, and a stable internet connection. The GM will confirm whether to use a virtual tabletop or video chat and will provide digital handouts and a dice roller. In person, just two ten-sided dice will suffice. If you're interested in comparing online options, check out online play platforms.
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