Until the 26th of April, everyone can have a first look on the free online game before its official launch - even without a key! The "Board the Servers Days" are supposed to be a performance test for the game.
InnoGames wants to find out how many players are able to play on one world at the same time. Furthermore, all participants have the chance to win a key for the Closed Beta, which would allow them to continue playing after the 26th.
As a purely free-to-play online game, users only need a Unity 3D plugin, which is available for all current browsers.