probably the ammo cheat.
The best website to find cheats for Grand Theft Auto 4 is without a doubt IGN, they have a comprehensive selection of cheats for many games including Grand Theft Auto 4. Cheats for Grand Theft Auto 4 can also be found in most gaming magazines.
I'd say San Andreas, Grand Theft Auto 4 and some others.
Personaly, I think GTA SA is the best because it actually is the longest game and it has way better cheats
If you would like a selection of GTA San Andreas cheats, suggest you try this site:www.psxextreme.com
For my money i would say San Andreas (SA) Since i have both
On Grand Theft Auto Online?
my opinon it sanadreas
The jetpack is not ordinarily available in grand theft auto IV. Your best bet is to check for a mod (or a cheat). If there is a mod available, this would need to be generated by a computer. Suggest you look on the gtawiki site and their modifications and cheats sections, for more information.
grand theft Auto series, fable
grand theft auto 4