Diep.io vs Moomoo.io
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.
Moomoo.io
Moomoo.io follows the incredibly simplistic style used in most IO games, but its gameplay is quite different from what you'd expect. Unlike having a similar gameplay to games like Slither.io or Agar.io, this game is more of a strategy game where you move around the map collecting resources to build a village of your own. You can then construct windmills to generate gold for you to use, but you'll have to defend your windmills from hostile players... which are everywhere on the map frankly.It's a pretty intense multiplayer game, but it definitely brings a new form of gameplay to the iconic IO games genre. If you're interested to try it out, you can do so for free straight from your browser.