A game-theory classic: each team votes X or Y every round and scores against everyone else's votes. The debrief flips the question from 'who won' to 'how much did we all win together'.
XY is a versatile team strategy game that challenges players to win as much as they can over ten rounds, where each team must choose between X and Y in every round.
Depending on the team's own vote and the votes of all teams, each team scores differently per round. At the end, the debrief focuses on the total score of all teams rather than the leaderboard between them — forcing everyone out of a competitive mindset and into inter-team collaboration and the bigger picture.