SEGA announces the launch of Spiral Knights, Three Rings' free-to-play MMO action/adventure game that's shown off in this launch trailer. "The response we have seen from players during the preview has been fantastic," said Daniel James, CEO of Three Rings. "We are tremendously proud of the team; they have worked hard over the last four years to bring the co-operative fun of Spiral Knights to life and we are delighted to be bringing their game to the world in partnership with SEGA. All that is left to say is: Watch out for those jelly cubes!" Here's more:

Spiral Knights pits players against the creatures of Cradle, where they must fight to survive by scavenging materials from the ever-changing worlds beneath the surface. The game features:

• A constantly changing world brought to life in a vibrant, retro-inspired visual style
• Intuitive pick-up-and-play controls (including both mouse-only and gamepad control)
• Opportunities for players to create guilds, craft new gear, and customize the looks and abilities of their characters
• Easy matchmaking for co-op mayhem with parties of up to four players
• Gear and weapons upgradeable through adventuring or through the purchase of Crystal Energy