Lugaru (pronounced Loo-GAH-roo) is a DRM-free, third-person action game available for Mac, Windows, and Linux. The main character, Turner, is an anthropomorphic rebel bunny rabbit with impressive combat skills. In his quest to find those responsible for slaughtering his village, he uncovers a far-reaching conspiracy involving the corrupt leaders of the rabbit republic and the starving wolves from a nearby den. Turner takes it upon himself to fight against their plot and save his fellow rabbits from slavery.
via: Wolfire Games

Lugaru HD has a lot of controls with many combinations to perform many martial-art techniques, but don't worry, it comes with tutorial mode so you can do some practices before jump into the real battlefield.

If you still remember, Lugaru HD was included in Humble Indie Bundle that meant you have to pay for playing Lugaru HD and other games included in the bundle. Fortunately, on May 11th 2010, Wolfire Games announced that Lugaru HD was open-sourced, so you can download it, modify it, and redistribute it for free.

Lugaru HD can be installed easily by adding Playdeb repository:
  • echo "deb oneiric-getdeb games" | sudo tee /etc/apt/sources.list.d/playdeb.list
  • wget -q -O- | sudo apt-key add -
  • sudo apt-get update
Please change "oneiric-getdeb" with your distributiion. In case you are using Natty change it to "natty-getdeb".
Once, Playdeb repository has been added, type the following command to install Lugaru HD:
  • sudo apt-get install lugaru
Lugaru HD is available for other Linux distributions, Windows, and Mac OSX. Please click here for further information.

For additional information, here is a demo video about Lugaru HD: