The 3d20 system is the

role-playing game system A role-playing game system is a set of game mechanics used in a tabletop role-playing game (TTRPG) to determine the outcome of a character's in-game actions. History By the late 1970s, the Chaosium staff realized that Steve Perrin's ''RuneQuest' ...

used in '' Neuroshima'' and ''

Monastyr ''Monastyr'' is a Polish role-playing game published in 2004. It is set in a dark fantasy world of Dominium. Its setting features a fantastic equivalent of the Age of Enlightenment. Most often, the game plots are cloak and dagger-like and invo ...

''. Like the d20 System, it uses twenty-sided dice, but unlike that system it most typically uses three.

Core mechanic

#name the skill to be tested and the difficulty level #roll three twenty sided dice #compare all three separate results with the given

attribute Attribute may refer to: * Attribute (philosophy), an extrinsic property of an object * Attribute (research), a characteristic of an object * Grammatical modifier, in natural languages * Attribute (computing), a specification that defines a prope ...

#if at least two of the three results are lower than the attribute modified by the difficulty level, test is successful.

Details

When a test is required, the

Gamemaster A gamemaster (GM; also known as game master, game manager, game moderator, referee, or storyteller) is a person who acts as an organizer, officiant for regarding rules, arbitrator, and moderator for a multiplayer role-playing game. They are m ...

, names the

skill A skill is the learned ability to act with determined results with good execution often within a given amount of time, energy, or both. Skills can often be divided into domain-general and domain-specific skills. For example, in the domain of w ...

which is going to be tested (or a raw

, if no skill is available for the activity the

character Character or Characters may refer to: Arts, entertainment, and media Literature * ''Character'' (novel), a 1936 Dutch novel by Ferdinand Bordewijk * ''Characters'' (Theophrastus), a classical Greek set of character sketches attributed to The ...

is trying to perform). He also sets a difficulty level for the test, which modifies the attribute value (reducing or improving it). Then, the character's skill level is taken into account - if the character does not have any skill levels in the given skill, (in case of Neuroshima) the difficulty level is raised by one, or (in case of

), all the three rolls (not two) have to be lower than the tested attribute. Otherwise, the player can subtract a total of his character's skill levels in that skill from any of the three dice rolls, each separately.

Difficulty levels

Special rules

*Suwak ("Slider") is a special rule of this game system. It says that when a character has at least four 4 levels in a skill, each time that skill is tested, the difficulty level is automatically lowered by one; if their skill level is 8 or 12, then difficulty is lowered by two or three levels respectively. It's supposed to depict the fact that the more trained a character becomes, the easier those things they trained seem to them. *Lucky 1 - each time when making a test roll a player rolls "1" on any dice, he is lucky and manages to perform easily; in the terms of mechanics, the test is treated as if the difficulty level was lower by one. ''Notice:'' if the player rolls two "1's", the test is automatically successful. {{RPG systems Role-playing game systems