The three series of maps before the imprisoned world are becoming more and more difficult. Now its fourth map of the winter is returning to the original difficulty. You appear in this primitive snow forest, there are only some trees around you to help you make new adventures. There is a wall around you, which cannot be destroyed. Your activity area is limited in the wall. Each time you complete a achievement, the boundary of the wall can expand. After completing some primary achievements, you can find a box with tool resources that provide you to dig. If you are looking for a map of adventure, whether it is machine play or friends with friends! Whether you are an old player or a rookie just started, this map is suitable for you who like me who likes me, challenge all kinds of achievements!