Collusion is played with a standard deck of cards. Each player is dealt 13 cards and then 13 tricks are played. The object is to win exactly the same number of tricks as one other player. More precisely players score 1 point for each trick, and if exactly two players win the same number of tricks, they add 10 points, if three players win the same number of tricks, the fourth player adds 30 points. During the play any two players can collude by agreeing to try to both finish with a given number of tricks.
More information can be found at https://www.parlettgames.uk/oricards/collude.html
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