Arraw.io is a 2D multiplayer archery game that is played in a green environment in which you can move with your arrow keys on your keyboard and shoot using your mouse.
You can play Pacxon in a99.io as unblocked.
You can play BlockTanks.io in a99.io as unblocked.
You can play Friday Night Funkin in a99.io as unblocked.
Do you recall the generic minesweeper game that was pre-installed in Windows operating systems? This is the multiplayer version of that game but in a slightly different way.