The original game Into The Odd is an innovative and inspiring minimalist RPG by Chris McDowall. It has inspired many in the RPG community to create derivatives, hacks, or genre variants—the Mark of the Odd family. In this article, I will focus on those that caught my attention the most.

First, a brief introduction to Into the Odd itself, which balances on the edge of fantasy, industrial horror, and steampunk, utilizing elements of cosmic weirdness. Players take on the roles of explorers seeking wealth and mysterious artifacts called Arcanum.

Mechanically, the game is built on simplicity—characters have three attributes (Strength, Dexterity, Willpower), and all actions are resolved by rolling under their values. Combat is fast and deadly, as every attack hits automatically, and damage is rolled immediately. The game also eliminates traditional classes, with characters defined by their equipment.

The original version was released in 2014, while the 2022 remastered edition brought expanded content and new visuals by Johan Nohr (MÖRK BORG). In the Czech Republic, Into The Odd Remastered was published in 2024 by Mytago under the title Do podivna.

Swords, Magic, and Brave Mice: Fantasy RPGs

Mausritter

In this game, players portray small, brave mouse heroes. From a mouse's perspective, the setting is a vast and dangerous world where players face threats like cats, owls, or humans.

Mechanically, the game differs from Into the Odd primarily through its innovative card-based inventory system, which combines equipment, conditions, and magic, as well as its emphasis on minimalist rules for quick character creation and sandbox adventures. You can learn more about Mausritter on our blog.

Cairn

A dark fantasy game focused on exploring the mysterious and dangerous "Wood," full of strange creatures, hidden treasures, and unspeakable horrors. The setting is minimalist and merely suggested, allowing players and the Warden (GM) to flesh out the world as needed.

Mechanically, the game combines systems from Into the Odd and Knave while maintaining rule simplicity. Characters have no fixed classes and are generated quickly and randomly.

Blades into the Odd

This is a dark Victorian fantasy RPG that combines the setting of Blades in the Dark with the minimalist rules of the Into the Odd system. The setting is the city of Duskwall, full of intrigue, the supernatural, and criminal gangs, where players portray members of thieving crews trying to survive and thrive in this dangerous environment.

Mechanically, the game adopts the simple Into the Odd system, which emphasizes fast gameplay and deadly combat, and adapts it for Blades in the Dark-style stories. It adds elements like resources, gang relationships, and action planning, while keeping the mechanics minimalist.

Block, Dodge, Parry

An expansion for the Cairn RPG by Yochai Gal. With version 2.0, it is fully playable as a standalone game—players can use it as an add-on to Cairn, Into the Odd, Electric Bastionland, or other Mark of the Odd games, or as a complete system for their own adventures. Block, Dodge, Parry adds many new mechanics and tools, such as expanded defense options (blocking, dodging, and parrying), a background-based skill system, rules for injuries, diseases, social conflicts, and more. It focuses on integrating fiction into the rules and providing meaningful choices to players during the game.

Odd Knaves

Odd Knaves is an RPG that combines the minimalist systems of Into the Odd and Knave, creating a hybrid ruleset for OSR (Old School Renaissance) style play. The setting is not fixed, but the game is designed to support exploration and adventure stories in any fantasy world, from dungeons to the wilderness.

Mechanically, the game merges elements of both systems: the simplicity and deadly combat of Into the Odd with the inventory-oriented approach and character flexibility of Knave. Players can play classless, with character roles defined by their equipment and creative approach. The game supports quick character creation, emergent storytelling, and easy compatibility with other OSR products. If the term OSR (Old School Renaissance) is new to you, I recommend reading our blog post What is OSR.

Brawl of the Odd

Brawl of the Odd is an RPG focused on duels and PVP arenas, compatible with various systems, including Into the Odd and other Mark of the Odd games. The setting is not fixed, as the game is designed as a module that can be implemented into any world or campaign where players want to resolve conflicts through arena combat.

Mechanically, the game adds structured rules for arena-style combat between players and NPCs. It includes options for various attack types, tactics, and environmental interactions, encouraging creativity and strategy during fights. The rules are simple and easily integrated into other systems.

Detachment

A skirmish wargame based on the Into the Odd system, adapted for fast and simple miniature combat. The setting is not fixed, but the game focuses on conflicts between Warbands in diverse environments, where players complete objectives like retrieving treasures or eliminating enemies.

Mechanically, the game retains the minimalist approach of Into the Odd but adds rules for controlling "Detachments"—units representing larger groups of fighters. These Detachments function as single entities with multiple HP, improved damage (d12 against individual targets), and immunity to standard attacks unless they are "explosive" or "large-scale enough." Players can create their own units using a point system and manage resources during combat.

Runecairn

Runecairn is a post-apocalyptic Viking fantasy RPG inspired by games like Dark Souls and Elden Ring.

The setting takes place after Ragnarök, when most of the nine worlds of Norse mythology have been destroyed, the gods have fallen, and players take on the roles of Vikings trying to survive in a melancholic and inhospitable world full of ruins, monsters, and secrets.

Mechanically, the game is based on the Cairn system but adds elements inspired by soulslike games. Instead of Hit Protection, it uses Resilience, which combines physical and mental endurance (Vitality and Vigour).

Players can lose Resilience during combat or failed actions, and upon reaching zero, they become a "Shade"—a hollow, lifeless being. Bonfires serve as safe zones for resting, recovery, and strengthening characters using "Souls," which act as both currency and experience points. The game also includes an expanded system of weapons, armor, and special abilities, as well as tables for Omens upon failure.

Weird North

Weird North is a sword & sorcery RPG that builds on the Into the Odd system and adapts it for play in a strange, mysterious world full of magic and ruins. The setting focuses on players as wandering mercenaries and adventurers exploring a vast, enigmatic world full of dangers and opportunities.

Mechanically, the game retains the simplicity of Into the Odd but adds elements that support world-building and emergent storytelling. It contains tools for generating environments, NPCs, and events using tables, allowing for easy preparation and improvisation during play. The game is designed as both a system and a toolkit that can be used for your own adventures or to adapt existing modules.

Spellburn & Battlescars

Another sword & sorcery game, inspired by dark fantasy full of magic, monsters, and danger. The setting is open, focused on the personal stories of heroes in a brutal world of ruins and ancient artifacts.

Mechanically, the game is based on Into the Odd but adds a Luck attribute, dangerous and unpredictable magic, and a slightly modified inventory system. Spells can cause permanent character changes.

The game was released in 2024 by authors Matheus H. Moraes and Luís F. Anizell. It is available on itch.io.

As Above, So Below

Rules inspired by Into the Odd, Knave, and Cairn. The setting focuses on exploring dark dungeons and wilderness on the fringes of civilization, emphasizing danger and emergent storytelling.

Mechanically, the game maintains a minimalist approach, offering quick classless character creation, dungeon exploration procedures, and a fast, deadly combat system. It includes tools for sandbox play and encourages creativity from both players and the GM.

The game was released in 2022 by Harsh Realm Press LLC and is available on itch.io.

Sky & Steam Miscellany

A steampunk fantasy game compatible with the Into the Odd system and other Mark of the Odd games. The setting is inspired by Victorian aesthetics, where players portray the working class with strange abilities in an industrial world full of airships, ghosts, and mechanical creations.

Mechanically, the game brings new tools, such as rules for airships, tables for generating ghosts and mechanical creations, an elemental magic system, and two complete starter scenarios. Each module is designed as a separate "folio sheet" for easy use and printing. The game was released in 2023 by Dodocahedron Games and is available on itch.io.

Equa!

A minimalist OSR RPG that focuses on simplicity and flexibility. The setting is not fixed, allowing players to adapt the rules for any environment or story, from fantasy to sci-fi.

Mechanically, the game is built on simple rules that include basic OSR mechanics, such as success rolls and an emphasis on creative problem-solving. The rules are designed to be easy to understand and quick to use during play.

The game was created by James Chip and is available as an A6 zine or PDF on itch.io.

Into the Dungeon

An RPG inspired by the minimalist Into the Odd system, focused on dungeon exploration and survival. The setting is flexible and allows players to explore dangerous and strange underground worlds full of monsters, traps, and mysterious artifacts.

Mechanically, the game is built on rule simplicity with an emphasis on quick decision-making, resource management, and discovery. It includes procedural dungeon generation, ensuring variety and replayability. Players face deadly challenges, where creativity and strategic thinking are the keys to success.

The game was released in 2024 and is available on itch.io.

Skorne

A dark fantasy RPG inspired by works like Dark Souls and Berserk. The setting takes place in a world ruled by the demonic prince Skorne and his armies, where players portray renegades fighting to overthrow tyrants and liberate enslaved people.

Mechanically, the game uses a simple system with minimal dice rolling. It includes 42 unique "Renegade Packages" that define character abilities, and many tables for generating environments, enemies, and events. The game has three clear endings: defeating Skorne, the destruction of the world, or the death of all renegades.

Brighter Worlds

A fantasy RPG that combines minimalist rules with extensive character customization options. The setting is flexible, allowing players to explore worlds full of magic, adventure, and absurd humor. The game supports a lighter tone, with mechanics reflecting a creative and interactive approach to storytelling.

Mechanically, the game is based on Cairn, Electric Bastionland, and Macchiato Monsters, but adds a full spell system (50 spells and 50 rituals), unique classes called "Callings," and a "step dice" system (d4 to d12) instead of the traditional roll-under-attribute. Characters progress by recording significant moments in an "Epitaph," which serves as an experience system. The game also includes tables for generating equipment that reflects character attributes.

A Journey into the Past: Historical and Ancient RPGs

Pike & Shot

An add-on for Into the Odd that brings the game's minimalist system to the 17th century, specifically the era of musketeers, pikemen, and dramatic battles. The setting is a historical environment where players can experience conflicts inspired by the Thirty Years' War, the English Civil War, and other significant events of the time.

Mechanically, the game retains the core Into the Odd rules but adds new elements reflecting 17th-century military tactics and technology. Players can use special equipment like muskets and face challenges associated with leading battles in this historical era. The add-on also includes tools for creating scenarios and environments.

The game was created by PelleP and is available on itch.io as part of an Into the Odd hack collection. This add-on is ideal for players who want to combine simple rules with historical context and tactical challenges.

Into the Bronze

Into the Bronze is a sword & sorcery RPG set in Bronze Age Mesopotamia, specifically between the Tigris and Euphrates rivers. The setting is inspired by the myths and history of ancient Sumeria, where players face gods, demons, and intrigue at the dawn of civilization. The game offers an atmosphere full of magic, ancient ruins, and epic adventures.

Mechanically, it is an Into the Odd hack that retains its minimalist approach to rules but adds elements specific to the Bronze Age environment. The game includes 36 different character backgrounds, 6 of which have access to a modular magic system based on intonations. It also offers tables for scenario and hex map creation, a bestiary with unique creatures, and tools for sandbox play.

The game was created in 2020 by Guilherme Gontijo, edited by Isaac Williams, and translated by Willy Alencar. It was published by Lantern’s Faun and SoulMuppet Publishing. Rules and other materials can be found on platforms like itch.io or DriveThruRPG.

Strange Worlds and Steampunk: Weird Fiction RPGs

Electric Bastionland

A steampunk OSR (Old School Renaissance) game that builds on minimalist rules and imaginative play. The setting takes place in the city of Bastion, a chaotic and surreal center of humanity with a 1920s aesthetic. Players represent characters with failed careers who try to pay off a massive debt by seeking treasures in this strange world.

Mechanically, the game expands the Into the Odd system while keeping the rules simple. It adds over 100 "failed careers" that define characters and create the world through their stories. The game also emphasizes emergent storytelling and content generation during play.

Knights of the Road

An alternative history and monster-hunting RPG based on the Into the Odd system. The setting is a dystopian version of the early 20th century during the Dust Bowl in the USA, where players portray members of the International Brotherhood of Itinerant Sellswords (IBIS)—wandering monster hunters who travel by rail and take contracts to eliminate supernatural threats like werewolves, vampires, or other legendary creatures.

Mechanically, the game retains the simplicity of Into the Odd but adds new elements specific to its environment. Players have three attributes: Vim (physical condition), Sense (perception), and Wit (intelligence). Characters start with "Dumb Luck" (temporary HP), a lucky charm, and basic equipment based on their previous profession. The game also includes tables for generating names, environments, and tasks, as well as mechanics for vehicles and rail combat.

We Deal in Lead

A weird western RPG inspired by the Dark Tower series by Stephen King. The setting takes place in a post-apocalyptic world known as the Drifted World, where players portray Gunslingers—legendary warriors traveling between worlds, fighting chaos, and seeking the meaning of their existence.

Mechanically, the game is based on the Cairn and Into the Odd systems, with simple rules focused on fast gameplay. It uses a d20 roll-under-attribute system, fast and deadly combat, and unique mechanics for duels and the Gunslinger order. The game supports both solo play and group campaigns and includes tools for generating worlds, enemies, and adventures.

Survival in a Ruined World: Post-Apocalyptic RPGs

Death is the New Pink

A post-apocalyptic punk game inspired by works like Tank Girl, Judge Dredd, Fallout, or Mad Max. The setting takes place in a chaotic, violent world full of anarchy, where players portray "Meat Bags"—tough survivors trying to gain resources, cause chaos, or simply survive.

Mechanically, the game is based on the Into the Odd system but adds its own modifications, such as mutations and unique items called "Doodads." The rules are fast, action-oriented, and destructive, with an emphasis on simplicity and DIY aesthetics.

Into the Zone

Into the Zone is a survival horror RPG inspired by works like Stalker and Annihilation. The setting takes place in dangerous Exclusion Zones, where players portray Stalkers—outcasts and adventurers who risk their lives searching for Relics for scientists, collectors, or paramilitary factions. The zones are full of radiation, anomalies, mutants, and other deadly threats.

Mechanically, the game is based on the Into the Odd system, retaining its minimalist approach while adding survival horror elements. Players manage limited resources and face deadly challenges in an environment randomly generated using tables and cards. The game is designed for one player, making it ideal for solo play.

Mutants of Ixx

A post-apocalyptic science-fantasy RPG that builds on the minimalist Into the Odd system. The setting is a world full of mutants, dinosaurs, and aliens, where players portray survivors in an inhospitable landscape full of strange technologies and dangers.

Mechanically, the game retains the simplicity of Into the Odd but adds elements specific to the post-apocalyptic environment. It includes 18 unique mutations that provide characters with special abilities, and 10 specializations that define their skills. The rules are designed to fit on two pages, supporting quick preparation and fast gameplay.

Eco Mofos

Eco Mofos is an ecopunk survival game based on the Into the Odd and Cairn systems. The setting takes place in a post-apocalyptic world destroyed by climate catastrophe, where players portray a group of survivors trying to find a safe place for a new beginning. The game combines elements of hope and the struggle for survival with an emphasis on community building.

Mechanically, the game offers rules focused on quick character creation, procedural environment generation, and a "burdens" system (emotional baggage) that affects inventory and decision-making. Adaptations instead of traditional levels allow characters to gain new abilities through physical changes, substances, or equipment. The game also includes robust tools for no-prep play, including random tables, maps, and generators.

Cyberpunk and Deep Space: Sci-Fi RPGs

Super Blood Harvest

A sci-fi horror RPG that combines dark futuristic elements with survival and surrealism. The setting takes place in a dystopian universe where players start on the surface of the Moon at an abandoned temple as the last free humans from Mars, fleeing from hostile killer robots.

Mechanically, the game adds its own rules and content, including new maps, monsters, playable classes, and loot, all contained in three interconnected zines. The game emphasizes simplicity, fast action, and atmospheric horror.

Neon Hack

A cyberpunk OSR (Old School Renaissance) RPG that brings a minimalist approach to rules and focuses on fast action and stylish storytelling. The setting is a dystopian neon world full of megacorporations, hackers, and technological chaos, where players complete dangerous missions in a digitally connected city.

Mechanically, the game draws inspiration from Into the Odd but adapts the system for a cyberpunk environment. It adds elements like hacking mechanics, cybernetic enhancements, and an emphasis on creative problem-solving. The rules are simple, allowing for quick character creation and fast gameplay.

Cyber

A cyberpunk OSR RPG that adapts the minimalist Cairn system for a dark near-future world ruled by megacorporations and advanced technology. The setting focuses on a dystopian society where players portray hackers, mercenaries, or survivors trying to navigate the dangerous environment of both the digital and physical worlds.

Mechanically, the game retains the simplicity of Cairn but adds elements specific to the cyberpunk environment, such as hacking mechanics, cybernetic enhancements, and rules for software and hardware. Emphasis is placed on resource management, quick decision-making, and emergent storytelling.

Monolith

A science-fantasy RPG that combines the minimalist approach of Cairn and Into the Odd with a rich sci-fi environment full of strange aliens, lost civilizations, and ruthless factions. The setting focuses on exploring a vast and mysterious galaxy, where players portray brave adventurers who take on dangerous missions and discover hidden secrets of the universe.

Mechanically, the game is built on the simple slot-based inventory and resource management rules known from Cairn, but adds new elements specific to the sci-fi environment. These include rules for ammunition, psionic abilities, stress and panic, planet/alien/faction generation, as well as expanded options for starships and their combat. The game is designed as "Traveller lite," meaning it offers enough depth for long-term campaigns while remaining accessible thanks to simple rules.

Meteor

Meteor is an adventure sci-fi RPG that uses a minimalist system inspired by Into the Odd and adapts it for stories in the distant future, where players portray a crew of diverse characters facing tense and stressful situations in a corporately controlled galaxy. The setting emphasizes a futuristic environment full of intrigue, technological challenges, and dangerous missions.

Mechanically, the game is built on the simplicity of Into the Odd but expands it with elements specific to the sci-fi genre, such as rules for starships, hacking, and interaction with alien technologies. The game emphasizes emergent storytelling and creative problem-solving, supporting quick character creation and fast gameplay.

Demon Star

A science-fantasy RPG that builds on the Into the Odd system and reshapes it for adventures in a cosmic environment full of magic, monsters, and danger. The game takes place in the Algol system, a star space full of mysteries, where players portray adventurers trying to survive and leave their mark as heroes or destroyers.

Mechanically, the game retains the minimalist approach of Into the Odd but adds innovations like devastating "Arts" (special abilities), modifiable weapons, vehicles, and rules for interacting with alien technologies. The game also includes tools for the Star Master (GM) that facilitate world generation, story creation, and game element management.

QZ: Welcome to the Quarantine Zone

A sci-fi horror RPG inspired by works like Roadside Picnic (Stalker) and Annihilation. The setting takes place in a quarantine zone where the laws of nature have ceased to apply, and players portray scientists, soldiers, or scavengers trying to survive and uncover the secrets of this strange place.

Mechanically, the game is built on the Into the Odd and Electric Bastionland systems, adding 100 "alterations" (strange character changes), 40 items with unique effects, 80 compact encounters, and tables for generating anomalous landscapes. Emphasis is placed on exploration, survival, and interaction with factions like the Laboratory, the Guard, and the Underground.

Fear and the Paranormal: Chilling Horror RPGs

Liminal Horror

A modern survival horror RPG that builds on the minimalist Cairn system (and indirectly Into the Odd). Players portray ordinary people who become investigators facing unknown horrors that disrupt their reality. The setting is a modern world where the mundane environment clashes with supernatural and terrifying elements, creating a contrast between the familiar and the disturbing.

Mechanically, the game uses three basic stats (Strength, Dexterity, and Control) and a "Stress" and "Fallout" system, which replaces traditional mental health mechanics. Fallout can have both negative and positive impacts on characters, highlighting their transformation during the game. Combat is deadly and often a last resort, with the game emphasizing creative problem-solving and storytelling.

Agents of the O.D.D.

An RPG falling into the genre of paranormal investigation and modern horror, built on the minimalist Into the Odd and Electric Bastionland systems. The setting focuses on players as agents of the secret government organization O.D.D., tasked with investigating supernatural phenomena, eliminating dangerous entities, and solving mysterious events. It draws inspiration from comics like Hellboy, Planetary, or The Laundry Files.

Mechanically, the game retains the simplicity of the original system but adds new elements to support investigations and missions.