Press ~ during game play in single player mode to display the console window. Then, enter one of the following codes to activate the corresponding cheat function.

Effect - Code

God mode - god
No clipping mode - ghost
Flight mode - fly
999 ammunition for all weapons - allammo
Set field of view; default is 70 - fov
First person view - behindview 0
Third person view - behindview 1
Suicide - suicide
Bots in multi-player game - addbots
Spawn WEC; for upgrading weapons - summon VehicleGame.WeaponEnergyCore
Disable flight and no clipping mode - walk
All weapons - allweapons
Toggle invisibility - invisible
Kill all - killall
Unknown - loaded
Unknown - unloaded
Unknown - loadspmap
Unknown - supersquad
Unknown - oldmovie
Unknown - lightperiod
Unknown - lightcone
Unknown - getfirstmission
Unknown - pawnanimextra
Unknown - soundocclusion
Unknown - smiteevilavatar
Unknown - summon
Unknown - blindai
Unknown - bindenemies
Unknown - deafenemies
Unknown - MaxPointsPerTrail
Unknown - ParticleTrailInfo
Unknown - ParticleTrailData
Unknown - UnSuspendSpawning
Unknown - SuspendSpawning
Unknown - DestroyDeadBodyTimer
Unknown - GameDifficulty
Unknown - ResetMaxParticles
Unknown - ErrorMessageUnknownError
Unknown - CauseEvent
Unknown - SpawnParticle
Unknown - Amphibious
Unknown - AddVelocityMultiplierRange
Unknown - AddVelocityFromOtherEmitter
Unknown - MaxAbsVelocity
Unknown - LifetimeRange
Unknown - SecondsBeforeInactive
Unknown - RelativeBoneIndexRange
Unknown - HUDType
Unknown - SkeletalScale
Unknown - SpinCCWorCW
Unknown - MaxSpectators
Unknown - MeshNormal
Unknown - MeshScaleRange
Unknown - VelocityScaleRange
Unknown - StartMassRange
Unknown - ErrorMessageServerDown
Unknown - AddLocationFromOtherEmitter
Unknown - DefaultPlayerName
Unknown - FearCostFallOff
Unknown - MaxFearCost
Unknown - MaxParticles
Unknown - DeathMessageClass
Unknown - GameMessageClass
Unknown - FadeInFactor
Unknown - MutatorClass
Unknown - FadeOutFactor
Unknown - AccessControlClass
Unknown - Opacity
Unknown - BroadcastHandlerClass
Unknown - ColorMultiplierRange
Unknown - PlayerControllerClassName
Unknown - GameReplicationInfoClass
Unknown - SpawnFromOtherEmitter
Unknown - GameStatsClass
Unknown - VoiceChatter
Unknown - DampingFactorRange
Unknown - ExtentMultiplier
Unknown - DrawStyle
Unknown - TriggerDisabled
Unknown - AutomaticInitialSpawning
Unknown - GetErrorMessageForErrorCode
Unknown - NumVoiceChannels
Unknown - CollisionDelayedBySpeedOfSound
Unknown - UseRegularSizeScale
Unknown - GhostToggle
Unknown - SecurityClass

Select "Settings" option at the main menu. After that, select the "Cheat Codes" option, Then, either:

EBpwnz to unlock the exclusive EBGAMES multi-player Level or enter
GameStopPwnage to unlock the exclusive GAMESTOP multi-player Level.