
Delta Green TTRPG · Delta Green: The Role-Playing Game
Delta Green
Delta Green puts you in the shoes of investigators who know too much. Modern cities, quiet suburbs, and hostile backroads hide impossible truths. Cases start like a police procedural, then twist into creeping dread. The mood is tense, grounded, and tragic. People love it for the mix of clue-hunting, human drama, and cosmic horror that does not flinch. It is a great fit if you enjoy thrillers and the uncanny, or want to try Cosmic Horror with a clear mission in front of you.
With a professional Game Master, a session feels like a sharp investigation under pressure. You question witnesses, sift through evidence, and decide how far to push. Choices have weight. Violence is swift and costly. Tone and intensity are tailored to your group, and safety tools are standard. Good for beginners who prefer story first, and for veterans who want grit. Perfect for 2 to 5 adults, in one-shots for tense nights or linked operations for a slow-burn campaign.
How to play Delta Green
You roll percentile dice, which are two ten-sided dice that represent a number from 1 to 100. When attempting something risky, you aim to roll equal to or under 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 brutal. When faced with the impossible, you test your sanity to keep moving forward.
You should come 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 careful pacing. They adjust the mystery and horror to suit your comfort level, ranging from tense to terrifying. If tone is important to you, check GM playstyles and request a focus on investigative, gritty, or psychological elements.
One-shots unfold a single operation in one session. Pre-generated agents are common, and the story has a distinct beginning and end. Campaigns connect multiple operations with downtime, home scenes, and significant fallout. You observe stress and secrets accumulate over time, and minor choices can have major repercussions. 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 necessary. 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 confidently within minutes.
How frightening is it, and how do you manage safety?
Delta Green is intense, adult horror. Themes may include violence, gore, and psychological stress. Before play, your GM will establish lines and veils with you, and use 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 adjusts the pacing and clue density to ensure everyone gets their moment in the spotlight.
How does Delta Green differ from D&D?
It is modern, grounded, and investigation-led. No classes or levels. You create an agent with skills, a job, and personal connections. Combat is quick, lethal, and typically the last resort. Supernatural elements are rare, unknowable, and perilous to utilise. Sanity and Bonds track the personal cost of the work. Compared 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 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 pregenerated ones?
Both options are viable. For a one-shot, pre-generated agents allow you to jump into the case quickly and come with built-in hooks. For longer campaigns, creating your own agent helps you engage with Bonds and background. Group creation 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 bring 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 exceptionally well online as evidence, maps, photos, and audio clues are easily shared. You just need 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, two ten-sided dice will suffice. If you want to explore online options, check out online play platforms.
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