Four episodes, 36 levels. Kill zombies, lot of monsters and 3 bosses, with 7 different kinds of weapon
The
first chapter of the challenge. You are a space mariner, you are in your
base on Phobos, a Mars moon. Something got wrong with a teletransporting
experience... All your collegues are death, and now you are the only survivor
of an alien invasion from Hell, unfortunatly, you’ll have to go through
the Hell to kill the bastards. 
Cheats:
- IDDQD
- God mode (on/off)
IDFA - Weapons - IDKFA
- Weapons and keys
IDSPISPOPD - Noclip mode (on/off) - IDCLEV(x,y)
- Map warp
IDDT - All map (on/off)
IDCHOPPERS - Chainsaw
IDBEHOLD s v i r a l - Powers up
Powers up:
s -bersek strengh, v -invunerable,
i -invisible, r -radiation suit, a -computer map, l -nightvision
After
killing the demons on Phobos, you get back home... only to discover the
awful truth: The invasion is now on Earth, and you are the only one who
can save your own specie from be extint ... A new linear episode, 32 levels.
New monsters and plus the new double-barreled shotgun .
Cheats:
- IDDQD
- God mode (on/off)
IDFA - Weapons - IDKFA
- Weapons and keys
IDCLIP - No clip mode (on/off) - IDCLEV(x,y)
- Map warp
IDDT - All map (on/off) IDCHOPPERS - Chainsaw IDBEHOLD s v i r a l - Powers up
You
are an hero, you saved earth and all humanity from the eternal nightmare,
so, you go back to space for taking a desired vacation, but... The Nightmare
can’t never let you rest, and you go to battle again. Two new Doom episodes:
The Plutonia Experiment, and The Evilution.
64 levels . 
THE DOOR
OF HELL
The
new Doom 2 Megawad - 32 levels
by Pedroom
Pic of "Vietnam" map (level 32)
After facing the Hell on Phobos and escaping of have your flesh consumed, returning to your home planet to find it slaughtered by demons, being forced to face the and beat the Masters, discovering that evil could even be more evilved and, finally, defeating the inferno's menace known as Plutonia Experiment, now you realize what, in fact, this nightmare you've being through is: endless. And now you have to fight one more chapter of this eternal battle.
You have found the door that leads to Hell; you have found THE DOOR OF HELL. And, congratulations, because you've been brave enough to open it.