When you register new account in spindder platform it will make new stellar account for you. Spindder hold crypto wallet for you to make game play more easy. Just transfer some amount of XML to join any game or create new one. Game account have option to send XML to any other account.
You can also play without registration. Choose any game table and transfer some XLM to this game account. Game platform will assigne auto nickname for you. If you will win all game table amount will be send out to your stellar crypto account.