Wonder Sky is an indoor children's play facility near Gyeongpo Beach and Sea Mark Hotel in Gangneung, open to users from babies to adults. Floors 1 and 2 hold the baby and kids zones, while floors 3 to 5 hold the extreme zone for users at least 120 cm tall. Because the facility is used floor by floor, visitors can stay for two to three hours, with a maximum of two jump sack uses per person and non-slip socks required. Weekends and public holidays are crowded, and play space is limited for those 120 cm and under.