F1: Inf.Health
F2: Inf.Nitro
F3: Inf.Timer
F4: Inf.Cash
F5: Inf.Gadget
F6: Inf.Ammo
F7: Inf.Exp

Notice:

First lose health then activate health cheat
First use nitro then activate nitro cheat
First fire you gun once then activate ammo cheat
First gain money once then activate money cheat then gain money again to get effect
First gain exp once then activate exp cheat then gain exp again to get effect
First wait for game timer to start counting down then activate freeze timer cheat
First throw a bomb then activate gadget cheat