Open beta is free for all. Everyone can enjoy this voxel-based game.
Taken from the official website:
Come experience Trove, an amazing voxel-based MMO where your creativity is the star. Explore vast worlds filled with fearsome lairs and dungeons. Acquire mighty weapons and rare treasures. Create a home for yourself in your very own Cornerstone, or join with other players in forming a Club to create your own world!