Natural phenomena have had an odd behavior lately, seasons seem to have been disrupted and animals are migrating in the wrong direction. The 24 East Asian traditional solar terms are out of sync.
Your seasons must find their alignment so the sun can find its route again and set the order right among all living things.
15 Days is a 1-4 player set-collection game. To win, you need to arrange the 24 solar terms by placing the cards in ascending or descending order.
Updated rules here