1) Add Police Car or Hospital Car Alarm
2) Add more ways people can gain money ( Shooting Rage )
3) Add military cars like Tanks , Jeep ( Speed 15, Can shoot )
4) Add Pets ( Dog , Cat , Mouse , Dragon , etc )
5) Add rank for each level :
Level 1 = Newbie
Level 10 = Amateur
Level 30 = Professional
6) Add fast food restaurant ( Sell burger , hotdog , chicken wings )
Each of them give player 50 HP