This is a Doom 2 and modification where are Cs 1.6 weapons.Start with zdoom.exe.

IMAGE
 
http://www.google.lv/imgres?imgurl=http://i.ytimg.com/vi/uX73bafWW5U/0.jpg&imgrefurl=http://www.encyclopedia.com/video/CS-czg_nuks-doom-2-rickroller.aspx&usg=__AaAqxa0f6G5WYZgiRkKK8Q2UAjI=&h=360&w=480&sz=18&hl=lv&start=0&sig2=kZYgY2QC2-Yn2lzAvLqXBA&zoom=1&tbnid=xrabEtCET6fDhM:&tbnh=127&tbnw=166&ei=11v8TfHuOoyVswb_6fXvDQ&prev=/search%3Fq%3Dcs%2Bdoom%2B2%26um%3D1%26hl%3Dlv%26biw%3D1280%26bih%3D694%26tbm%3Disch&um=1&itbs=1&iact=hc&vpx=849&vpy=213&dur=1954&hovh=194&hovw=259&tx=112&ty=71&page=1&ndsp=27&ved=1t:429,r:11,s:0&biw=1280&bih=694


BACKGROUND

The sequel to the groundbreaking FPS Doom, you return to Earth having finally escaped the moon base, but the Demons you had fought back up on the Moon have beaten you back to Earth and have overrun towns and cities. It's once again up to you to show these alien scum that while there's still life in you, they haven't won yet!
Gameplay
The game is a shooter, so, the player has to shoot every enemy that is attacking him. He has also to find keys for opening specific doors and he has also to activate switchs for making his environment change (a lift coming down, a wall that is an hidden door, etc.).

FEATURES

30 new levels plus 2 secret hidden levels
Old enemies return as well as new enemies including the deadly Arch Vile who is able to revive dead enemies
A new weapon - the Super Shotgun
More items to help you on your mission such as Megaspheres that grant you full health and armour

CHEATS

    All Weapons + Ammo
    Cheat code: idfa
    All Weapons + Ammo + Keys
    Cheat code: idkfa
    Beserk Pack
    Cheat code: IDBEHOLDS
    Bonus Level
    Cheat code: idclev31
    Choose Game BGM
    Cheat code: IDMUSXX
    Note: (XX is a number)
    Computer Area Map
    Cheat code: IDBEHOLDA
    Entire Map
    Cheat code: IDDT
    God Mode
    Cheat code: iddqd
    Invisibility
    Cheat code: IDBEHOLDI
    Invisible to Enemies Until You Attack
    Cheat code: FHSHH
    Invulnerability
    Cheat code: IDBEHOLDV
    Level Warp
    Cheat code: IDCLEV XX
    Note: (XX is the level number, like 06)
    Light Amp Goggles
    Cheat code: IDBEHOLDL
    No Clipping Mode
    Cheat code: idclip
    Radiation Suit
    Cheat code: IDBEHOLDR
    Replace Fists with Chainsaw
    Cheat code: idchoppers
    Show Position in Code
    Cheat code: idmypos
    Wolfenstein 3D Level
    Cheat code: idclev32 

HARDWARE REQUIREMENTS

486 processor operating at a minimum of 66MHz or any Pentium® /Athlon® processors
Compatible with Win95/98/ME/2000(worked on XP and 7)
8 MB RAM
20 MB of uncompressed hard disk space
100MB of free hard drive space for the Windows swap file
A 100% Windows® 95/98/ME/2000-compatible computer system including compatible 32-bit drivers for video card, sound card and input devices
A 100% Windows® 95/98/ME/2000-compatible true 16-bit sound card and drivers
100% Windows® 95/98/ME/2000-compatible mouse and driver
100% Windows® 95/98/ME/2000-compatible keyboard

After download please Seed!
This is my first upload so please comment!