14 DAY TRIAL // Rochard, a game built on the Unity engine by Recall Games, and perfectly compatible with the Linux platform, was launched on Steam a while ago and it just received its first DLC.
Rochard is a very interesting 2D platformer that heavily relies on physics for its gameplay. Even if the developers had some porting problems at first, they overcame them and managed to get it on Steam for Linux.
Recoil Games has just released their first DLC (downloadable content) for the game, called Hard Times, and it adds four new challenging puzzle levels: 'Container Chaos,' 'Shaft Shuffle,' 'Brainyard,' and 'Assembly Line.
According to Recoil Games, these levels were added because the community thought the original ones were too easy.
More details about this release can be found in the official announcement. You should also check out review of Rochard.