METTLE Core vs Mischief

Compare METTLE Core and Mischief side by side. See differences in complexity, dice, genre, and more.

	METTLE Core	Mischief
Genre	Universal, Modern	Fantasy
Tags	Pulp Action, Toolkit, Hackable, Rules-Light, Classless, Fast-Paced, CC-Licensed Rules	Rules-Light, Classless, Gonzo, Comedy, Fast-Paced, Fiction-First, Low-Prep, Improvisation, Character-Driven, Hackable
Core Mechanic	Roll a pool of d6s equal to the Attribute being used. Dice showing 1, 2, or 3 are summed as the Score; dice showing 4, 5, or 6 are counted as Edge. The Check succeeds if Score meets or exceeds the Difficulty (Routine 1 to Nigh Impossible 15), and Edge measures how well it went. On a failure with Edge, the player may call for a Twist: accept a complication proposed by the rest of the table, then reroll the Edge dice for a second chance. Initiative passes from the acting character to the target of their Action, who becomes the next to act. Mettle (Motive + Nature) acts as a combined morale and damage track, and characters may Surge by spending Mettle for bonus dice on critical Checks.	Roll a d12 and add BODY, MIND, or WILL, then read the total on a five-tier scale: 12+ is a Critical Success, 9–11 a Success, 5–8 a Mixed Success, 2–4 a Failure, and 1 or less a Critical Failure. Natural 12s and 1s are always critical. Each instance of Good or Bad Luck adds a d12 and keeps the highest or lowest result.
Dice	d6 dice pool	d12
Complexity	Low	Low
Availability	Free core rules	Free core rules
Runnability	5 of 5 book tools	3 of 5 book tools
License	CC BY 4.0	Made for Mischief Third-Party License
Third-Party Publishing	Not yet researched	Commercial publishing allowed — Made for Mischief Third-Party License
Summary only, not legal advice. Check current terms before publishing.
Publisher	Planarian Games	Drimbus
Year	2021	2026
Languages	English	English
Best For	Groups who want fast pulp action-adventure in the vein of Indiana Jones, James Bond, or Tales of the Gold Monkey, with a hackable toolkit they can bend toward detective stories, wild-west gunfights, post-apocalyptic survival, or grounded science fiction.	Groups who want quick, swingy fantasy sessions with comedic magic, freeform character concepts, and advancement tied to each character's personal goals.
Highlights	Score-and-Edge dice pool reads two outcomes from the same roll: whether the action succeeds (Score meets Difficulty) and how well it went (count of 4–6 dice). Player-invoked Twists let a failed roll be reframed as a messy success in exchange for a fictional complication chosen by the rest of the table. Six-attribute character sheet (Calling, Culture, Frame, Motive, Nature, Poise) replaces classes and skills with player-written Descriptors that justify which Attribute applies to a given task. Initiative passes from the acting character to the target of their Action, eliminating turn-tracking and tying combat order to who is acting on whom.	Opponents use a single Power score as roll modifier, damage track, and persuasion threshold, so one number runs a creature in both combat and conversation. Characters level up by checking off items on a player-written Bucket List, tying advancement to personal goals rather than experience points. Abilities and spells share one list and are normally Exhausted by a failed roll, so magic needs no spell slots or mana.
Considerations	Toolkit framing means the book provides scaffolding (factions, NPC seeds, sample castaway adventure) rather than a fleshed-out setting: groups expecting a defined world will need to build or borrow one. Mettle does triple duty as morale, hit points, and a spendable resource for bonus dice, which can take a session to internalize. Twist resolution depends on the rest of the table proposing complications, which slows play if the group is hesitant to add fiction.	A failed roll exhausts the Ability used until a Rest or Healing restores it, so a character starting with three Abilities can lose most of their tricks within one Conflict. Base attack damage is usually 1, or 2 on a critical, so weapons mostly differ in accuracy, critical range, and Luck conditions. Wounds add a -1 penalty and then Bad Luck on every roll, so injured characters get steadily worse at escaping danger.