By 
Bring down the console by pressing the ~ (tilde) key, activate cheats with “sv_cheats 1”
/g_gravity <>0-800 Change gravity
/cg_thirdpersonangle <-360-360> Change view angle
/cg_thirdpersonrange <320-500> Change view range
/model sarge/krusade Hidden Sarge skin
/kick botname This kicks off a bot from the game.
/addbot botname You can add in any bot.
/timelimit or /fraglimit You can change the preset limit in SP games to a shorter (or longer) amount of frags.
/give 25 health Gives 25 health pack
/give 50 health Gives 50 health pack.
/give ammo Gives 999 of all ammo.
/give medkit Gives a medkit.
/give all Gives all weapons (except grappling hook) and full ammo, health, and armor.
/give weapons Gives all weapons except grappling hook.
/give battle suit Gives Battle Suit. Use again to lengthen time.
/give flight Gives Flight. Use again to lengthen time.
/give grappling hook Gives grappling hook, which doesn’t come with /give all.
/give haste Gives Haste. Use again to lengthen time.
/give heavy armor Gives Heavy Armor
/give invisibility Gives Invisibility. Use again to lengthen time.
/give mega health Gives Mega Health.
/give personal teleporter Gives Personal Teleporter.
/give quad damage Gives Quad Damage. Use again to lengthen time.
/give regeneration Gives Regeneration. Use again to lengthen time.
/give rockets Gives you a pack of rockets, replace with ammo of your choice.
/give rocket launcher Gives you a rocket launcher, replace with weapon of your choice.
/give armor Refills armor
/give health Refills health.
