Arrow.io vs Diep.io
Arrow.io
Arrow.io is a simple yet addictively fun and competitive MMO game where you run around an arena collecting blue gems, hunting down other players, and trying to stay alive for as long as you can. Available on only Android and iOS (those are the official ones), this game can be played via the 2 virtual joysticks on both sides of your screen - one is for movement and the other, to shoot at your preys. There are tons of cute block-like heroes to play as, each of them have their own preferred way to kill whether ranged or melee and will offer you a slightly different game experience. The map also has many walls which act as barriers for you to take cover as necessary.Arrow.io may be a very simple-looking game, but it is among the most popular IO games there is on the mobile platform. If you love multiplayer PvP games that you can immediately hop into, this is a great IO game to play. Do check it out!
Diep.io
Diep.io is a fun tank-like IO game where players play as pencil-drawn tanks on a piece of white (and sometimes gridded) paper filled with other hostile tanks as well as a variety of obstacles and Polygons. Shooting at Polygons and other players will earn you points to level up your tank to the next tier, unlocking a wide range of upgrades (or "classes" as the game calls them). At frequent intervals, AI-controlled bosses will be spawned allowing players to work somewhat cooperatively to earn a ton of experience points.Many players are calling out Diep.io as being a clone of the previously popular Tank.io (not sure what happened to Tank.io though), but considering that it's currently the last game standing, I guess it's safe to say that new players will never know about Tank.io but will instead be able to enjoy its legacy through Diep.io.