Kill everyone you think might be a real player! Be steathly and don't stab randomly, or you will give away the fact you're a real player. Strike when the time is right.
WASD to move.
Left click to target player.
Spacebar to stab player.
Move with controls.
Tap to target player.
Press A button on screen to stab.
Scout out players you think are real during the day, and stab at night.
More tips inside the game spawn screen :)