S.U.N. is a strategy board game played with cards and tokens.
Each player represents one of the species of the space federation that competes with the others to be the most technologically advanced without open hostilities. The first player to reach 21 technology points wins.
It combines the obtaining of resources to build technologies and get the points to win, with an important component of negotiation with the rest of the players. The diplomatic proposals are advantages that you can obtain, but they have to be voted among the players for their approval, so you will have to negotiate to convince them. You will have the opportunity to be President, or to become a despotic Emperor.
You can keep your promises, or not. And you can play Subterfuge behind the backs of your peers...
You decide the reputation you want to have in the Federation.
—description from the designer