Multiplayer games in the online casino have become popular, which has enhanced the social interaction aspect and the retention of players. Multi-players, in contrast to single players, involve direct interaction between players and their opponents in real-time, which makes the experience somewhat more social and communal than it would be in an open casino. 

Multiplayer games have a significant effect on the community of players where players tend to be closely knit with each other. Such games always contain chat options, ratings, and besides, cooperative/competitive tasks that imply communication. They are important because not only do they improve the gameplay making it enjoyable for gamers but also because they enhance gamers' loyalty. Players are more likely to come back to a platform where they can find other players or friends, thus relationships contributing to higher levels of retention. In the same manner, the existence of other players adds fun and rivalry to the game to make the gaming experience more realistic and stimulating. 

Nevertheless, the adaptation of multi-player games into online casinos brings about some technological and design issues. It’s important that interruptions don’t occur and that the gameplay remains stable, especially when the users are playing simultaneously. This means having powerful servers and fast connections, as well as software designed to process multiplayer interactions without any hitches or lag. Furthermore, social interaction must be entwined with gameplay so that the social aspect is complementary and does not hinder the gaming experience. 

The other issue is the design of a safe environment for multiple player interactions. With the raised social element, one can face fraud, collusion, and some other improper actions. This is why online casinos must engage in strict measures such as monitoring their patrons and moderating their games appropriately. 

Therefore, multiplayer games are an important feature of online casinos as they introduce the aspect of socialization between gamers and increase attendance. Despite the general benefits, the successful application of these games entails consideration of technological and design issues, resulting in a safe, fun, and glitch-free environment for the players.