Spiral Knights

Spiral Knights is a massively multi-player online role-playing game developed by Three Rings Design and published by Sega. In the game, the player controls a knight of the Spiral Knights order, which has crash-landed on the mysterious planet Cradle. Knights collectively explore the Clockworks, the mechanized, constantly reorganizing dungeon that fills the planet's interior. The knights equip armor and weapons to aid them in their battles against the monsters inhabiting the Clockworks. When they are not exploring, knights trade with each other and with vendors, in order to improve their equipment.

Spiral Knights is a top-down, third-person, real-time action-adventure game, comparable to The Legend of Zelda: Four Swords Adventures. While thousands of knights may be participating in Spiral Knights at a time, any given knight interacts directly with only a small subset of them. For example, in Haven there are typically tens of knights present; however, there are tens of independent copies of Haven being maintained simultaneously. When a knight is in the Clockworks, he interacts with only three (or fewer) other knights, as well as numerous monsters.