Left 4 Dead 2 : Hard Rain Alone
This is a video from my Custom Mutation « 1 Evil Day » (Or « Cleaning Time », as you wish.). Basically, you're alone with a Katana and an AK47 and you have to fight zombies. There's no increase nor decrease in their number, Hordes will spawn as usual, and there is no Special Infected (Apart from Witches in the Sugar Mill and Tanks in the Finales.). So you can say it's a reversed « Last Man On Earth ». Heh.
Now, I had some trouble beating the Tanks at the end of Hard Rain, because I didn't have any Molotov and I couldn't take them on dry land, because Tanks do not suffer from move-speed penalty in water. So... voilà.
Most campaigns are achievable through this Mutation (Apart from The Sacrifice for obvious reason.). Dead Center and The Passing are quite hard (On Normal !), but not impossible. The major problem is dealing with zombies AND Tanks during the Scavenge Finale (However I didn't have any Molotov, so I was really alone against these Tanks.). The Gauntlet Events are difficult but possible.
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At this time, GbZeKamikaze has 850 views for Left 4 Dead 2 spread across 7 videos. His channel published less than an hour of Left 4 Dead 2 content, roughly 8.65% of the content that GbZeKamikaze has uploaded to YouTube.