Add this source in Cydia: http://cydia.myrepospace.com/TROJANGamesincTV2/
Now install "NOVA 3 Unlimited Ammo and Coins Hack" from the same repo
Reboot your device
~You now have infinite ammo & coins~
This is the first NOVA 3 infinite ammo & coins hack made, special thanks to Cydie for developing a .DEB, Cydia compatible executable file for me.