24XX
A lightweight tabletop roleplaying system for creating games in any setting, with an emphasis on description and narrative positioning rather than detailed procedures. Players resolve actions by rolling polyhedral dice and using the highest result, keeping the focus on the fiction instead of mental arithmetic. The rules are released under a Creative Commons Attribution 4.0 license and include advice for adapting the files into original games.
Dice Pool (Roll multiple dice vs target)Dice Step (variable dice vs. static target)Action Table (table determines action outcomes)
Free, on web, Android and iOS
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Game facts (players, playing time, age, credits) from BoardGameGeek.