Kids on Bikes vs METTLE Core

Compare Kids on Bikes and METTLE Core side by side. See differences in complexity, dice, genre, cost, and more.

	Kids on Bikes	METTLE Core
Genre	Horror, Modern	Universal, Modern
Play Style	Mystery, Worldbuilding, Collaborative, One-Shot Friendly, Drama, Beginner-Friendly, Cinematic	Pulp Action, Toolkit, Hackable, Rules-Light, Classless, Fast-Paced, Open Source
Core Mechanic	Six stats (Brains, Brawn, Fight, Flight, Charm, Grit) each get a single die from d4 (terrible) to d20 (superb), with the assignment determined by a chosen Trope (Brilliant Mathlete, Loner Weirdo, Popular Kid, etc.). Roll the relevant stat die against a GM-set difficulty; rolling the die's maximum 'explodes' and the die is rerolled, adding the values together. Failed rolls grant Adversity Tokens, each spendable for +1 on a future roll. Combat is fully narrative: there are no hit points; the margin between attacker and defender rolls determines injury severity and who narrates the outcome. Age (child, teen, or adult) grants +1 to two relevant stats and unlocks a free Strength. Each campaign also features a Powered Character co-controlled by all players through shared Aspect notecards and a pool of Psychic Energy tokens.	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.
Dice	d4–d20	d6 dice pool
Complexity	Low	Low
Accessibility	Medium	Very High
Runnability	Medium	Very High
License	Proprietary	CC BY 4.0
Cost	$$	$
Publisher	Hunters Entertainment / Renegade Game Studios	Planarian Games
Year	2018	2021
Best For	Groups who want collaborative small-town supernatural mystery in the vein of Stranger Things or Stand By Me, where character relationships and tropes matter more than mechanical complexity. Especially well suited to one-shots, short campaigns, and tables that include players new to TTRPGs.	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.
Highlights	Pre-built Tropes turn character creation into a five-minute step, Setting Boundaries safety tools are integrated as the very first step before play, collaborative world-building constructs the town and seeds rumors before the first session, the Powered Character mechanic distributes shared narrative control of the supernatural element across the table via Aspect notecards	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.
Considerations	Combat is fully narrative with no hit points or initiative, which can frustrate groups who want tactical structure, difficulty setting is entirely GM judgment with example anchors but no formulas, the shared-control Powered Character can confuse players new to collaborative narration, long-campaign play requires the GM to invent advancement and pacing because the rules are tuned for one-shots and short arcs	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.