The offer will last until May 27 and it's only on Steam for Linux
Rochard, a game built on the Unity engine by Recall Games, and perfectly compatible with the Linux platform, can now be bought with a 75% discount.Rochard is a 2D platformer that relies on physics for its gameplay. You control the main character and his powerful G-Lifter in a story narrated by the famous Jon St. John (voice of Duke Nukem).
A 50% discount also applies to the newly release Rochard: Hard Times DLC, which is also available for Linux.
Linux System Requirements:
• OS: Ubuntu 12.04 32-bit (Unity2D session preferred) or Ubuntu 12.10 32-bit
• Processor: 2.6GHz single core
• Memory: 1GB
• Graphics: OpenGL 2.0 compatible video card with 256 MB shared or dedicated RAM (ATI or NVIDIA)
• Hard Drive: 3GB
More details about this release can be found in the official Steam website. You should also check out review of Rochard.