Tragedy of the Commons is a relatively simple on the surface. There is a 5x5 grid of numbers, and you and each other player must choose five of those numbers. If nobody else picked the number you chose, then you score that many points. If someone else did choose your number, you get no points for that choice. The strategy of the game is trying to figure out what other people will pick. Tragedy of the Commons comes with several grids and variants that alter the game in small but significant ways, and can be played in a few minutes or an hour depending on how many rounds you want to play. —description from the publisher