Another great game for retro-gaming enthusiasts, Onikenmimics the look, the music, and the difficulty of an old-school NES game like Ninja Gaiden for free on your computer. The game is still in beta, but you're much more likely to die from its brutal difficulty than from any bugs.
A simple compilation showing some gameplay.
>>> Free Download Now (Size: 21.3Mb)
Choose a different mirror: http://www.oniken.net/p/download.html