Tragedy Looper is a scenario-based deduction game for four players: one scriptwriter and three detectives. The game consists of four location boards and a number of character cards. Each scenario features a number of characters, hidden roles for these characters (serial killer, misinformant, murderer), and some pre-set tragedies (murder, suicide).

Each "day" (turn), players and the scriptwriter play three face-down cards onto the characters, then reveal them to move the characters around or affect their paranoia or good will stats. At the end of each day (turn), if the scenario has a tragedy set for that day, it happens if the conditions are met, i.e., certain characters have certain stats or are in a certain location together (or not together) with others. As tragedies happen, players loop back in time, restarting the scenario from the beginning and trying to deduce who the culprit was and why along with all of the other hidden rules for the scenario.

The players win if they manage to maintain status quo — that is, if no tragedies occur to the key individuals — for a set number of days, within a set number of loops. If not, the scriptwriter wins.