Quake 2 MP.1 - The Reckoning cheats and cheat codes for PC

Press the ~ key to bring down the console. 
And type the following commands for the following effects. 

Noclip - Walk through walls. 
Give All - For All guns and ammo 
God - For God Mode 

Weapons and ammunition
During the game play, hit ~ (tilde) to bring up the console, then 
type any of the following codes:

give trap
give phalanx
give mag slug
give ionripper
give dualfire damage


Level select
Press ~ (tilde) to bring down the console window, then type 
"map [level code]" using the following map names:

Name - Level code
Water Treatment Plant - w_treat
Waste Sieve - xsewer2
The Warehouse - xware
The Swamps - xswamp
The Hangars - xhangar2
Strogg Freighter - xship
Sewers - xsewer1
Refinery - refinery
Outer Compound - xcompnd1
Outer Base - outbase
Lower Hangars - xhangar1
Intelligence center - xintell
Inner Compound - xcompnd2
Industrial Facility - industry
Core Reactor - xreactor
Cargo Bay - xmoon1
Badlands - badlands