The Ambidex game from Virtue's Last Reward inspired me to try and make a deduction game for my next project. Below are the rules I used to playtest with some friends last night:

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Each round players are randomly paired into teams to play a guessing game. After each player secretly chooses between the numbers 0, 1, and 2 the moderator reveals every outcome one team at a time. Players gain points equal to the number they chose during the guessing game. However, if both players of the same team chose the same number they both lose the amount of points instead.

At the start of a new round all players are randomly paired into new teams. Repeat this until one or more players win by reaching 8 points.

After the first round, once per round, any player may call for a re-pairing of teams. If all other players agree via a majority rules vote the teams are randomly paired again before proceeding.

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We had fun, but unanimously agreed there was something missing. It's meant to be played with at least 4 players, so before I make any major changes I wanted to playtest with larger groups. Any thoughts or ideas would be helpful.

The most suggested thing would be to add roles, similar to Werewolf or Mafia. Another friend suggested adding "agendas" or unique win conditions for different players. In this scenario I'd remove the 8 point win limit, and give every player their own separate winning requirement.

Another friend thought I should take more from the Ambidex game. In it, groups of three must vote against one another in a 2 vs. 1 match. If both sides vote "Ally" they both gain 2 points. If one side votes "Betray" the betraying side gains 3 points and the ally side loses 2 points. If both sides pick "Betray" nothing happens.

I've gotten more feedback, but those two are the ones I've seen most from what I took down last night.