SiXeS is about things that are similar and different. Play six rounds, thinking of six things each round and trying to predict what you will write that will match — or not match — what the other players write, depending on whether you are in a "match" round or a "unique" round. The player with the most points after six rounds wins.
SiXeS is #6 in the E•G•G Series from Eagle-Gryphon Games.