ZEROSUM

ZEROSUM is a semi-competitive roleplaying game featuring a rotating gamemaster (GM). Players can challenge the GM regarding narrative details (truths) using a shared community token pool. 

ZEROSUM can be played using a pre-made scenario or in free-play mode. Scenarios provide setup directions, key events that will occur in the narrative, and endgame resolution guidance. A starter scenario, SHELTER, is available from Groovy Dad Games: https://groovydad.itch.io/shelter

Created for the One-Page RPG Jam 2026.

Please check out our other submissions to this year's jam:

BEHEMOTH SURVIVAL ROLEPLAYING GAME. A one-shot TTRPG focused on a monstrous entity’s attack on a city.

Diabolus in Musica (The Devil in Music). Church-sanctioned Minstrels investigate rumors of musicians using the forbidden tritone and battle devils in musical duels.

The TEMPORAL RPG. Agents of HOURGLASS investigate and aggressively "correct" temporal anomalies that threaten the homeland using temporal manipulation rigs (TMR). Based on our 28mm miniatures skirmish game of the same name.

WAR MAGE. A combat-focused TTRPG in which players portray squads of Imperium war mages and line infantry as they wage constant battle against endless waves of invaders.