God Mode Press the ~ key and then enter god at the command line. (Thanks to AzNkLiC696@aol.com)

All Weapons Press the ~ key and then enter impulse 9 at the command line. (Thanks to AzNkLiC696@aol.com)

Invisible Press the ~ key and then enter no target at the command line. (Thanks to QUILLMCC@aol.com)

No Target Press the ~ key and then enter impulse 255 at the command line. (Thanks to QUILLMCC@aol.com)

Walk Through Walls Press the ~ key and then enter no clip at the command line. (Thanks to QUILLMCC@aol.com)

Fly Press the ~ key and then enter fly at the command line. Press D to go up, and C to go down. (Thanks to QUILLMCC@aol.com)

Gain # Shells Press the ~ key and then enter GIVE S# at the command line. (Thanks to AMX69390@aol.com)

Gain # Nails Press the ~ key and then enter GIVE N# at the command line. (Thanks to AMX69390@aol.com)

Gain # Rockets Press the ~ key and then enter GIVE R# at the command line. (Thanks to AMX69390@aol.com)

Gain # Cells Press the ~ key and then enter GIVE C# at the command line. (Thanks to AMX69390@aol.com)

Get Weapon # Press the ~ key and then enter GIVE # at the command line. (Thanks to AMX69390@aol.com)

Gain # Health Press the ~ key and then enter GIVE H# at the command line. (Thanks to AMX69390@aol.com)

Commit Suicide Press the ~ key and then enter KILL at the command line. (Thanks to AMX69390@aol.com)

Warp to Episode X, Mission Y Press the ~ key and then enter MAP ExMy at the command line. (Thanks to AMX69390@aol.com)

Sets Difficulty Level (# = 0-3) Press the ~ key and then enter SKILL # at the command line. (Thanks to AMX69390@aol.com)

Silver Key Press the ~ key and then enter IMPULSE 13 at the command line. (Thanks to AMX69390@aol.com)

Gold Key Press the ~ key and then enter IMPULSE 14 at the command line. (Thanks to AMX69390@aol.com)

Reduce Gravity by #% Press the ~ key and then enter SV_GRAVITY -# at the command line. (Thanks to AMX69390@aol.com)