Diep.io

''Diep.io is a 2D tank shooter game that involves players fighting bosses, shapes, and other players. Created by Matheus Valadares and released in 2016, it became a quick hit, and is still a popular .io game. It has since spawned numerous sequels, including Arras.io and Obstar.io. Diep.io has several gamemodes and hosts a large number of active arenas per gamemode. Diep.io has its own Fandom Wiki and Wikipedia article.

Gameplay
Players play as tanks that try to shoot at each other, as well as randomly generating polygons. This allows players to gain experience, eventually leveling up, allowing them to select upgrades. Players can also choose a tank upgrade at levels 15, 30, and 45.

Upgrades
Commonly known as Stats, these upgrades help a player destroy shapes faster, have a better chance against enemies, or be able to ram enemies using an upgraded body. Tanks have 33 stat points, which may be put into the following upgrades (each one can be upgraded 7 times): If a player uses a Smasher branch tank, they only have Health Regen, Max Health, Body Damage, and Movement Speed, and are able to invest more stat points in each.

Shapes
Shapes spawn randomly throughout the map. Crashers are shapes that target the player. The Pentagon Nest, at the center of the map, spawns many pentagons and occasionally Alpha Pentagons. Very rarely, shapes may spawn green, which gives more experience.

Tanks
Tanks are used by players and finish their upgrade tree at level 45.

Bosses
Bosses are rare, randomly spawning entities that can overwhelm solo players. There are 5 bosses in the game: Guardian, a pink triangle that fires small crasher-like drones; Defender, a red triangle that fires traps and bullets; Summoner, a yellow square that fires necromancer drones; Fallen Overlord, a grey Overlord that fires many tiny gray crashers; and Fallen Booster, a grey Booster that attacks players by ramming.

Gamemodes
There are eight gamemodes in Diep.io, each with their own separate perks.

Community and Reception
The Diep.io community is known as among the most toxic, with bands of "hunters" chasing down the leaders of an arena or swamping the arena with bullets, rendering gameplay very difficult. However, the "more civilized" players have gone on to create the Diep.io Fandom Wiki, Wikipedia articles, and spinoffs of Diep.io such as Arras.io and Woomy-Arras.io.

The game has been critiqued by many magazines such as Vice, Player.One, and even Forbes. IT has been praised for its diverse gameplay offering a variety of playing styles and techniques. Famous YouTubers such as Sinbadx and Corrupt X create very popular content on Diep.io, and have hundreds of thousands of subscribers. Its very simple gameplay, active community, and well-balanced upgrades tree make it one of the most popular .io games ever.