This entry will mainly be for my reference on L4D and L4D2 related releases.

NES Left 4 Dead
Eric Ruth, an independent game developer is making an 8-bit version of Valve's 'Left 4 Dead'. The game will be available for download free of charge upon its release.

Gameplay videos can be viewed on Eric's Youtube channel

Quote from Eric regarding the NES version, "I want to make it very clear that the design aspect of this de-make was to create the game "Left 4 Dead" in a way that I feel it would have been handled back in 1986. The idea was NOT to remake it exactly like the Valve original. Back in 1986, games were generally 2 player...not 4. Yes, the system could handle it, and yes, 4 player games existed, but they were extremely uncommon. If this game had been done back then, realistically speaking, it would have most likely been done as a 2 player title. On top of that, games didn't generally use music to create "atmosphere" back in the 1980's. Plenty of titles were laced with music that honestly felt like it had no place amongst the game's soundtrack, but that's sort of the way things were back then. The little things that made games imperfect were also part of the inherent retro charm. A lot of things didn't make sense, and we just took it at face value, because, honestly, no Nintendo game ACTUALLY made any kind of sense and we liked it that way. "