Agar.io
Say goodbye to your afternoon. Start as a small blob. Eat other blobs to get bigger, repeat. Tag yourself with [RR] and try to play on East / West US (I play on West)
Changelog
Skin List(Just use the skins name as your nickname)
Eat blobs smaller than you to grow in size
Use the space bar to send 50% of your mass flying at a blob to eat it
Use the W key to eject some mass
Viruses are the mid sized green 'spikey' blobs which cause blobs larger than them to explode into many smaller parts if they consume them (at about 150~ mass you can absorb a virus and explode)
Small blobs (smaller than size 130~) can hide inside of viruses with no negative effects (use this to your advantage when starting out)
Every cell experiences a passive loss of mass in relation to their current size (larger cells lose mass much, much faster than smaller cells)
Score is simply the largest mass you have had this current life.
You must be 25% larger (mass) than another blob to absorb it (that means your diameter must be ~11% larger than another blob to absorb it)
Feeding a virus, by using w to eject mass into it, 7 times will cause it to create another virus which will launch out of the current virus and go somewhere from 7 to 12 units in distance

Ejecting causes you to lose 16 some mass related to your size but the ejected mass only has 90% of what you lost
The maximum number of cells you can be split into is 16
Viruses do not always cause the player to split; there is a cap to how many pieces you can be, which changes quite often and is currently 16, if you are already at this threshold you can simply consume a virus as though it were any other cell

At certain sizes you reach milestones which unlock new abilities (you can choose to display the mass of your cell by selecting "Show Mass" in the options when you name your cell):
? Size 32: Eject a blob of size 16 to increase your passive movement speed or feed a virus
? Size 150: Create another virus by feeding an existing virus 7 times
? Size 150: Large enough to explode an existing virus
? Size 1900~: Due to passive loss of mass (about 20/s) it becomes nearly impossible to retain size by eating neutral blobs (which only contribute a single point of pass each)
? Size 30,000 22,500: The Maximum Size Limit