ShootEm.io is one of the best .iO games that you can play online and test your shooting skill for free. You can walk around or get in a car and drive throughout the city. While moving, you need to defend yourself and survive. You are allowed to place walls to block incoming bullets instead of fighting in a direct way by using various types of weapons. Objects that you build in a couple of seconds can keep you safe until you stay at the top spot. Good luck!
How to play
Use WASD or Arrows to move, Space to pick up items and get in the car, LMB to fire, RMB to place walls.