Completing worlds will give that world ribbons, visible in the main menu. You will be given a ribbon that indicates how quickly you completed the world, with which faction you completed the world, and whether you completed the world on expert mode and/or with biospheres enabled. Completing a world again will allow you to expand your ribbon collection for that world, with up to 7 ribbons obtainable per world. Ribbons are shown to be glimmering, with a visible shine showing. They are also brightly coloured, with colours such as green or purple being used along with faction oriented colours such as red for Sons of Hephaestus, or blue for United Nations Space Administration.