Sliptoon is one of the three skins released in one part of the Gottems offer. It could be purchased on an individual basis with game coins in early March 2021.
Sliptoon could be purchased in the Skins Shop under the 'Gottems' tab for 2490 coins. This skin was available for a limited time and may not be available for purchase in the future.
Details of this offer can vary depending on location, platform or time.