Roulette
Ceres M Guide
The Roulette is a rotational event where you need to align a specific element in the middle and get the same one on the spinning board.
For each successful alignment you make, you get to level up your reward as shown on the screen. Getting the wrong element will use up your turn, however getting a skull will reset your reward back to 0. When you start, your wheel won't have any skulls in it.
Getting higher rewards will increase the amount of skulls on the wheel, so this game is really about luck. This event is good for getting a 4 star Core Summon Ticket for evolving your characters.