Slay.one is a great multiplayer combat game in which you use different weapons to fight other players across the map. It's a free-for-all game, so keep an eye on who's around you!
How to play: To play Slay.one, simply move around the globe with your WASD keys and fire with your left mouse. You can also turn weapons by using the scroll wheel. Turrets may also be mounted on the ground.
The basic technique in slay.one is to actually use map coverage to avoid incoming bullets from reaching you. You can take out your adversary even more quickly if you can get them to follow you, lead them out into the open, and then escape under cover.