There is an online shooting game called Gooz.online. You have to choose an area to play in before you can begin your task.
Shoot the red team before they kill you and take their money. To hit them harder in the next round, you'll need that.
It's best to get more ammunition and better armor. Try to aim well enough that you hit more targets than they do and be sneaky enough that they can't shoot you. Basically how to play any gun game.
Use the arrow keys or WASD to move around. To shoot, lift, and click. Once you have enough cash, you can buy better guns and armor and more ammunition, which you will need.
Have fun and good luck!