Venge.io, a browser FPS game I found just about a year ago and I'm having a lot of fun with it. Although I must say there are certain things in this game that frustrate me like invisible players, lag and difficulty in aiming. The movement in this game is actually wild and requires fairly good tracking and aim to hit people when they jump around left and right. Unfortunately in my case, I have terrible aim and tracking but I at least try to put in some effort though