Using standard NES controls, the character runs, jumps, shoots, and chucks grenades with the select button. The demake parallels the events of Halo: Combat Evolved, recreating each of the ten levels in side-scrolling platformy goodness, complete with end-level boss fights. (Word on the street is that PF Halo even has a “Legendary Mode”, which can even be unlocked after blazing through the game once.) Being a one-man team, Eric carefully coded and crafted all of the gameplay, visuals, and chiptune remixes to best fit the classic shooter, and the result leaves us with a satisfying single player experience.
http://blog.pikimal.com/geek/2011/01/18/pixel-force-halo-released-today/