F1 - Inf.Health
F2 - Inf.Stamina
F3 - Inf.Energy
F4 - No Reload
F5 - Inf.Cash
F6 - Mega Exp - Inf.Skill Points
F7 - Super Weapon Damage
Start game world then activate stamina and energy cheats
Get hit once then activate health cheat
Pick up a gun or switch to your gun then activate reload cheat
Open inventory and switch to cash view then activate cash cheat then close inventory and open it again and go to cash view and you will get the effect of the cheat.
First gain exp once by killing an enemy then activate mega exp and next time you gain exp it will be X100
First fire your gun once then activate super weapon damage and yo will be able to kill enemies 1 hit with firearms.