For New Players:
Press W=eject some mass to other players
Press SPACE to split your cell
Avoid the green spikes and other players
Try to eat as many cells as you can
For OK Players:
Teaming is very dangerous! Feed your team member as much mass as they give YOU!
You can use party mode, team mode, and Experimental Mode through clicking the FFA dropdown box!
You can use fancy copy-and-paste characters for nicks!
For the MASTERS:
You can eat the green viruses by splitting into 16 cells, and one cell must be big enough to eat the virus.
You can shoot viruses to other players by rapidly ejecting mass.
The bigger you get, the slower you get, so split into decently large cells to gain speed and to eat other people!
Good luck playing Agar.io!