Case Files is a TTRPG in which the players play hard-nosed 1920s noir detectives trying to solve a case by any means necessary. The game can be run with up to 6 players, with one player acting as the game master who controls the world and NPCs as they react to the player’s decisions. 

All the rules for this TTRPG fit on a single page with the other pages in the document containing GM advice and lists of skills and equipment. This system has been designed to be simple to understand, with rules straightforward enough to grasp in under 5 minutes.