Remarkably, before the The Calm event, the casinos were all unsheltered in open air. Therefore, every employee, patron, and thing at the casino were subject to the elements and even creatures that a foolhardy player could possibly lure from the nearby wilderness. Petitions have been sent to place casinos inside buildings but the receivers took a long time to respond, and finally did by a certain patch. Presumably, in regards to the copious income generated at the casinos that could have paid for a new building to house them in, the casino managers decided to place those funds on different priorities for some dubious reason.
General
Each of the three starter towns each have a casino, where you can gamble away your MMDs for prizes:
In each casino, you can purchase Low, Medium or High stakes gambling tokens, for a M Note, a MM Note, and 2 MMD Notes respectively directly from the Casino Owner.
Once you've purchased your gambling tokens, hand them to the respective Gamemasters, located throughout the casino.
In the Cloak of Darkness event, the casino rewards were upgraded substantially. For retired reward list see Casino/Retired. Also, Pack Dolls can no longer be handed in to the Casino Bosses for other rewards.