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Played a little Carcassonne a while back
(sopuli.xyz)
We had 3 or 4 sets.
And if you look closely, you can see some illegally placed pieces that somehow weren't noticed when placed
We used to play the game with 2× base game, ~3 or so expansions (including Inns and Cathedrals), and one mini expansion. The game would take several hours, and everyone would just attempt to build a single giant city with a cathedral to get 3 points per city tile.