Note: Story mode only.

Trainer options

Alt+Num 1 - Infinite Health 
Alt+Num 2 - Infinite Vehicle Health
Alt+Num 3 - Stun Gun Instant Recharge
Alt+Num 4 - Infinite Ammo/Grenades
Alt+Num 5 - No Reload 
Alt+Num 6 - Infinite Stamina
Alt+Num 7 - Infinite Armor
Alt+Num 8 - Infinite Special Ability
Alt+Num 9 - Infinite Oxygen
Alt+Num 0 - No Wanted Level
Alt+Num . - Freeze Daytime
Alt+Num + - Set Daytime
Alt+Num - - Timer -10 (Countdown Timer +10) Seconds 
Ctrl+Num 1 - Edit Money
Ctrl+Num 2 - Change Weather
Ctrl+Num 3 - Super Speed
Ctrl+Num 4 - Slow Motion
Ctrl+Num 5 - Teleport To Waypoint Location 
Ctrl+Num . - Save Location
Ctrl+Num + - Teleport 
Ctrl+Num - - Undo Teleport